1000(thousand,阡,仟,One thousand, Sen, Chi)Natural numberorIntegerAt999Next to1001Is the number before. As an abbreviation1kIs written.

nature

• 1000 isComposite numberAnddivisor The 1, 2, 4, 5, 8, 10, 20, 25, 40, 50, 100, 125, 200, 250, 500, 1000.
  • Sum of divisorsIs 2340.
    • 246 thExcess numberIs. The previous one996,next1002.
• = 1000 10³
  • 10 thCube numberIs. The previous one729,next1331^[1].
  • 3 thPower of 10Is. The previous one100,next10000.
  • Cube number Harshad numberIs the 6st number. The previous one512,next1728.
  • In cubic numberSum of each placeIs also the fifth number to be a cube. The previous one is 5, the next one is 1^[1]. (Online Integer Sequence DictionarySequence of A53058)
  • 1000 = (1 x 10)³
    • n = 1 (10n)³ When you see the value of0,next8000. (Online Integer Sequence DictionarySequence of A017271)
  • 1000 = (2 x 5)³
    • n = 5 (2n)³ When you see the value of512,next1728. (Online Integer Sequence DictionarySequence of A016743)
    • n = 2 (5n)³ When you see the value of125,next3375. (Online Integer Sequence DictionarySequence of A016851)
    • = 1000 2³ × 5³
      • Two differentPrime factorWith the product of p³ × q³ Is the 2st number that can be expressed in the form. The previous one216,next2744. (Online Integer Sequence DictionarySequence of A162142)
  • 1000 = 10 × 10²
    • n = 10 for 10n² When you see the value of810Next is 1210. (Online Integer Sequence DictionarySequence of A033583)
    • n = 10 for 100n When you see the value of900,next1100. (Online Integer Sequence DictionarySequence of A044332)
  • 1000 = 1 × 10 × 100
    • First term 1, common ratio 10Proportional sequenceUp to the third term inInfinite productIs. The previous one10,next1000000. (Online Integer Sequence DictionarySequence of A110147)
      • This value is n = 3 for 10^n(n-1)/2 Is the value of.
• 213 thHarshad numberIs. The previous one999,next1002.
  • 1th based on 4Harshad numberIs. The previous one100,next10000.
• Eachsum of squares Square numberIs the 76th number. The previous one is 1, the next is1022. (Online Integer Sequence DictionarySequence of A175396)
  • The sum of each place and the sum of the squares of each place are both the ninth number, which is the square number. The previous one900,next1111. (Online Integer Sequence DictionarySequence of A197125)
• EachCubic sum Square numberIs the 47st number. The previous one900,next1002. (Online Integer Sequence DictionarySequence of A197039)
• 1/1000 = 0.001
  • percentageThen 0.1%,Per milleThen it is 1‰.
  • Reciprocal Finite decimalIs the 28st number. The previous one800,next1024. (Online Integer Sequence DictionarySequence of A003592)
• = 1000 10² + 30² = 18² + 26²
  • Three differentSquare numberIs the 293rd number that can be represented by the sum of. The previous one997,next1009. (Online Integer Sequence DictionarySequence of A004431)
  • 2 つ のSquare numberIt is the 2rd number that can be represented by one sum of. The previous one986,next1010.
• = 1000 6² + 8² + 30² = 10² + 18² + 24²
  • 3 つ のSquare numberIt is the 2rd number that can be represented by one sum of. The previous one992Next is 1027. (Online Integer Sequence DictionarySequence of A025322)
  • Three differentSquare numberIt is the 2rd number that can be represented by one sum of. The previous one996Next is 1027. (Online Integer Sequence DictionarySequence of A025340)
• n = 1000 n と n If you make a number of -1素 数become.n と n This is the 1th number in which the number of -109s arranged is a prime number. The previous one990,next1002. (Online Integer Sequence DictionarySequence of A054211)
  • When making a number by arranging consecutive integers in descending order, a minimum of 3素 数Is the minimum number that can be. Next is 19930.

    Example. 1000999, 1000999998997, 1000999998997996995994993 are prime numbers. (However, the original number is not included.)

    • A minimum of 3 consecutive integers arranged in ascending order素 数The minimum number that can be done is 1826.
• 3 digits in the numberDouble eyesIs the tenth number with. The previous one999Next is 1110. (Online Integer Sequence DictionarySequence of A033284)
• = 1000 35² - 225
  • n = 35 n² - 15² When you see the value of931Next is 1071. (Online Integer Sequence DictionarySequence of A132772)

Other 1000

• SI prefixThen 1000 times is k (Kilo), 1/1000 is m (Milli).
• 1000'sprefix: Milli (Pull), Kilo, chili (Nozomi）
• 1000YearsBetweenMillennium(Millennium, Millennium).LatinThe etymology is "mille" which means 1000 and "annum" which means year. 1000 is 10century, 100Seasonal yearIn English, they are "ten centuries" (literal translation: XNUMXth century) and "hundred decades" (literal translation: XNUMXth century), respectively.
• Per milleIs called permill (‰).
• In English, 10000 (100000) is "ten thousand" (literally translated: XNUMX) and XNUMX (XNUMX) is "one hundred thousand" (literally translated: XNUMX).
• Currently published in JapanBank of Japan notesThe minimum amount of (banknote) is 1000 yen ( 1994Or later).
• In idiomatic terms, it is used to mean "tremendously many." Example: "Kaisen Yamasen","Ever-changing","A thousand'
• AutomotiveLicense plate"1000" was a lottery target number in the desired number system of 20011/4Was removed from the lottery number.
• 1000 series(List of railway vehicles with model name 1000)
• manyThread float type bulletin board OfthreadCan't write at 1000th less.
• HaliselbonTo sayFishThere is. Many people think that there are 1000 needles from the name, but this is wrong. Actually, it is about 400.
• 1000 Guinea TheHorse racing OfClassic race.UKAlthough it originated, there are races with the same name in each country.
• 1000 th素 数 The7919Therefore, it was discovered 7919th.小 惑星 ThePrimeWas named.

Numbers from 1001 to 1999

Numbers from 1001 to 1100

• 1001 = 7 × 11 × 13, The smallest number in the product of three prime numbers greater than or equal to 7Pentagon,Five-cell number,Palindrome,Wedge number
• 1002 --Sphenic number,Decimal number4-digit even minimum inNon-tortient
• 1003 - Half prime
• 1006 - Japanese radish OfDelicacy"Senrokuhon" (however, the etymology is Chinese acupuncture radish (Chenrope) and the numbers are Ateji), JapanEducation kanjiNumber of characters
• 1007 --Semiprime
• 1008 - Harshad number
• 1009 = 1³ + 2³ + 10³ = 4³ + 9³ + 6³ , 169nd素 数, The smallest prime number in 4 digits,Emmap(1009 ← → 9001)
• 1010 --Sphenic number,24-digit minimum Harshad number based on
• 1011 --Semiprime Harshad number
• 1013 - Sophie Germain prime,Square number with center
• 1014 -Harshad number
• 1015 -14thNumber of quadrangular pyramids,n Based on n Second Harshad number (n = 7)
• 1016 - n Based on n Second Harshad number (n = 8)
• 1019 -1021 and 36ndTwin prime, Sophie Germain prime andSafety prime(8th), Emirp (1019 ← → 9101)
• 1021 --Emirp (1021 ← → 1201)
• 1022 = 2¹⁰ − 2 = 2¹ + 2² + 2³ + 2⁴ + 2⁵ + 2⁶ + 2⁷ + 2⁸ + 2⁹ ,Friedman number
• 1023 = 2¹⁰ -1,Binary numberMaximum number that can be counted with the fingers of the hand when using^[2]
• 1024 = 2¹⁰ = 4⁵ = 32² ,Power of 2, Friedman number (4-2¹⁰)
• 1025 = 5² × 41
• 1027 = 2² + 3² + 5² + 7² + 11² + 13² + 17² + 19² , The sum of the squares of the first eight prime numbers.
• 1029 = 3 × 7³ = 3 × (18² + 18 + 1) = 4⁵ + 5
• 1031 --The 1033th twin prime number in combination with 37, Sophie Germain prime number,Super prime, Emirp (1031 ← → 1301)
• 1035 - Triangular number,Hexagon
• 1036 = 2² × 7 × 37.HexadecimalThen 4444₍₆₎ BecomeDouble eyes.. Previous 1₍₆₎ The777₍₁₀₎, Next 5555₍₆₎Is 1295₍₁₀₎.
• 1044 --The sum of twin prime numbers (521 + 523）
• 1049 -1051st twin prime, Sophie Germain prime with 38
• 1050 = 2 × 3 × 5² × 7 = 5 × 210
• 1051 - Pentagon with center
• 1053 = 3⁴ × 13, Harshad number,
• 1056 = 32 × 33,Number of rectangles,Sum of divisorsThe minimum number of 5 digits that can be represented by 4
• 1057 = 32⁰ + 32¹ + 32²
• 1060 = σ (6) + σ (28) + σ (496) (where σ is a divisor function), the sum of the first 25 prime numbers
• 1061 --The 1063th twin prime number in combination with 39, Emirp (1061 ← → 1601),π(10000) - π(1000) = 1061 (butπ(x) IsPrime-counting function)
• 1063 -Super prime
• 1065 = 3 x 5 x 71
• 1071 - Hexagonal number
• 1072 - Hexagonal number with center
• 1079 --Any natural number is represented by the sum of less than 1,079 10th powers^[3](Waring's problemPart of).
• 1080 = 5 × 2³ × 3³ = 5 × 216 , 3week(3 × 360), 5000 in senary₍₆₎ , Pentagonal number
• 1081 -Triangular number
• 1085 = 18² + 19² + 20²
• 1086 - Smith Number
• 1087 -Super prime
• 1089 = 33²,Nine-point number,Octagon with center
• 1090 - n Based on n Second Harshad number (n = 10)
• 1091 --The 1093th twin prime number in combination with 40, Emirp (1091 ← → 1901)
• 1093 - Hexagram, The smallest
• 1095 = 3 × 365 can be expressedleap yearNumber of days in 3 years when does not include
• 1096 - leap yearNumber of days in 3 years including
• 1097 - Approximate value of, Emirp (1097 ← → 7901)
• 1100 = 100 x 11, the smallest in multiples of 100Non-tortient

Numbers from 1101 to 1200

• 1102 - 19458/9Atomic bomb on NagasakiHHMM at the time of the explosion
• 1103 --Sophie Germain prime number, Emirp (1103 ← → 3011),Life gameInR PentominoTime to stabilize
• 1104 - (English edition）
• 1105 - Carmichael number, 13 x 13Magic square OfOne row of sum,Decimal number, Centered square number
• 1110 = 2 x 3 x 5 x 37 = 10¹ + 10² + 10³
• 1111 = 10⁰ + 10¹ + 10² + 10³ , 4ndRepunit, 111th palindrome in decimal, Smith number
• 1114 = 1² + 2³ + 3⁴ + 4⁵
• 1116 --Japanese female idol groupTHE PossibleAlbum. → 1116 (album)
• 1122 = 33 × 34,Number of rectangles
• 1123 = 33⁰ + 33¹ + 33²
• 1124 = 10² + 2¹⁰
• 1125 = 4³ + 5³ + 6³/1³ + 2³ + 3³ × 10²
• 1128 --Triangular and hexagonal numbers
• 1134 = 2 × 3⁴ × 7,Harshad number
• 1138 - George LucasVirgin work "THX 1138』. "Star WarsIn the series, this number appears somewhere in the work (Easter egg).
• 1140 - Number of triangular pyramids, The sum of twin primes (569 + 571)
• 1143 -Harshad number
• 1151 -1153st twin prime number with 41, 1151 = 229 + 922 The smallest number that becomes a prime number even if the numbers in which prime numbers are arranged in reverse order are added, Emmap (1151 ←→ 1511)
• 1152 = 2⁷ × 3²,Advanced torient number
• 1153 -Super prime
• 1155 = 3 × 5 × 7 × 11 .. From the beginning of 4 consecutiveodd number Of素 数Product of The previous one105Next is 15015.
• 1156 = 34²,(English edition）, Pentagon with center
• 1161 -Sum of the first 26 primes
• 1165 -Smith number
• 1171 -Super prime
• 1176 -Triangular number
• 1177 -Hexagon
• 1179 = 3² × 131
• 1183 - Five-sided pyramid
• 1184 -TwoFraternity The former of (1184, 1210)
• 1185 - n Based on n Second Harshad number (n = 15)
• 1187 -Safety prime
• 1190 = 34 × 35, The number of rectangles
• 1191 = 34⁰ + 34¹ + 34²
• 1196 = 5³ + 6³ + 7³ + 8³
• 1198 -Centered heptagon
• 1199 = 11³ - 11² - 11
• 1200 -Sum of twin primes (599 + 601)

Numbers from 1201 to 1300

• 1201 -Super prime, square with center,Emmap(1201 ←→ 1021),Hexadecimal numberOr in the forty-nine base, and 2401 base(English edition）
• 1202 = 19² + 20² + 21²
• 1210 = 11³ - 11² , The latter of two fraternity numbers (2, 1184)
• 1215 = 3⁵ × 5 = 6⁴ - 3⁴ = 6⁵ - 3⁸
• 1216 = 2⁶ × 19, Kakunin number
• 1217 -Super prime.
• 1221 = 3 × 11 × 37 = 33 × 37 = 11 × 111 .Palindrome,HexadecimalThen 5353₍₆₎ Will make the first two digits and the last two digits the same.
• 1223 - Sophie Germain prime
• 1224 = 3³ + 5³ + 7³ + 9³ , 4 consecutiveodd number OfCubic sumCan be represented by, the previous one is a perfect number496.
• 1225 = 35² , Triangular number, thirdSquare triangle number, Hexagon, octagon with center
• 1229, -1231 and 42ndTwin prime, Sophie-Germain prime, Emmap (1229 ←→ 9221),π(10000) = 1229 (butπ(x) IsPrime-counting function)
• 1231 --Emirp (1231 ← → 1321)
• 1233 = 12² + 33²
• 1234 - Leslie FistSongs
• 1236 -Sum of twin primes (617 + 619)
• 1240 -Number of pyramids
• 1241 - Number of cubes with center
• 1242 -Decimal number
• 1247 -Pentagon
• 1250 = 2 × 5⁴ .. The prime factor is 2ⁱ × 5^j Is a number. The previous one is 1, the next is1280.
• 1255 = 251 × 5 ,Friedman number
• 1256 = 3.14 x 4 x 100
• 1259 - An approximation to
• 1260 = 2² × 3² × 5 × 7 = 35 × 36 ,Advanced composite number,Number of rectangles, The smallestVampire number, Friedman number (21 × 60), out of the numbers 1 to 108I just can't divide it.
• 1261 = 35⁰ + 35¹ + 35² , Six-pointed star
• 1264 -Sum of the first 27 primes
• 1266 -Centered pentagon
• 1267 = 7 × 181
• 1275 -Triangular number
• 1277 -1279th twin prime paired with 43
• 1280 = 2⁸ × 5. The prime factor is 2ⁱ × 5^j Is a number. The previous one1250,next1600.
• 1283 -Safety prime, Emmap (1283 ←→ 3821)
• 1284 -Sum of twin primes (641 + 643)
• 1285 - NonominoNumber of the 4thNumber of Nice Friedman((1 + 2⁸) × 5)
• 1288 -Hexagon
• 1289 -1291st twin prime, Sophie Germain prime with 44
• 1295 = 5 × 7 × 37 = 35 × 37. In senary it is 5555Double eyes.. Previous 1₍₆₎Is 1036₍₁₀₎, Next 11111₍₆₎Is 1555₍₁₀₎.
• 1296 = 6⁴ = 36² = 2⁴ × 3⁴ = 16 × 81 ,Double square number.. The first 8Cube numberSum, 8 × 8チ ェ スOn the boardrectangleTotal number of. 6ⁿ The one before216,next7776.. The prime factor is 2ⁱ × 3^j Is a number. The previous one1152,next1458.
• 1297 -Super prime
• 1300 = 2² × 5² × 13 = 4 × 25 × 13

Numbers from 1301 to 1400

• 1301 --The 1303th twin prime number in combination with 45, the centered square number, Emirp (1301 ← → 1031)
• 1306 = 1¹ + 3² + 0³ + 6^4[4]
• 1307 -Safety prime
• 1320 --Sum of twin prime numbers (659 + 661)
• 1319 -1321 twin prime number, safety prime number with 46
• 1321 --Emirp (1321 ← → 1231)
• 1325 = 20² + 21² + 22² ,Markov number
• 1326 --Triangular and hexagonal numbers
• 1327 - Prime gapIs the smallest prime number greater than 30 (1361-1327 = 34)
• 1330 --Tetrahedral number,Ruth-Aaron Pair The former of (1330, 1331)
• 1331 = 11³, Centered heptagonal number, the latter of Ruth-Aaron Pair (1330, 1331), palindromeCube number(Even if 3 is written in N-ary notation of ∀N> 1331, 1331 is always a palindromic cube.Because)
• 1332 -Number of rectangles
• 1333 = 36⁰ + 36¹ + 36², The smallest 18-Hyper perfect number
• 1335 --Pentagonal number, "WaitingXNUMXFortunately those who reach the day. "(Book of Daniel (Chapter 12 verse 12)
• 1337 - sorry Means
• 1343 = 11³ + 11 + 1
• 1344 --For a number in a rowSum of divisorsIf you ask for, the number of 42 will be 1344. There are no 1344 numbers smaller than 42. In other words Meet n Is that there is one. (However, σ isDivisor function)^[5]
• 1350 -Hexagonal number
• 1361 --The larger of the smallest prime pairs (30-1361 = 1327) with a prime gap greater than 34
• 1364 - Lyca number
• 1365 - Five-cell number
• 1367 -Safety prime
• 1369 = 37² , Centered octagon
• 1371 -Sum of the first 28 primes
• 1378 -Triangular number
• 1379 -Sum of a row of 14 × 14 magic squares
• 1381 --Centered pentagonal number, Emirp (1381 ← → 1831)
• 1387 - (English edition）, Decagon
• 1395 --Vampire number (15 x 93)
• 1399 --Emirp (1399 ← → 9931)

Numbers from 1401 to 1500

• 1404 -Hexagon
• 1405 = 26² + 27² = 7² + 8² + ... + 16², 26th centered square number
• 1406 -Number of rectangles
• 1407 = 37⁰ + 37¹ + 37² , The third sphenic number that can be represented in this form. The previous one is 3, the next is 651.
• 1408 - Stephen KingShort stories
• 1409 -Sophie Germain prime, super prime
• 1412 - Television AnimationMagic Kaito 1412
• 1419 - Zeiser number
• 1426 -Pentagon
• 1427 -1429 and 47ndTwin prime
• 1430 - Catalan number
• 1431 --53rd triangular number, hexagonal number
• 1433 -Super prime
• 1435 --Vampire number (35 x 41)
• 1439 --Sophie Germain prime and safe prime (9th),The smallest prime number that can be made from the sequence of numbers. (Online Integer Sequence DictionarySequence of A174277)
• 1440 <p>2019<p>week(4 x 360), Highly totient number
• 1441 --The number of six-pointed stars
• 1444 = 38²,Roman numeralsIn notationPandigital numberThe smallest of those that are^[6]
• 1447 -Super prime
• 1451 -1453st twin prime, Sophie Germain prime with 48
• 1454 = 21² + 22² + 23²
• 1458 = 2¹ × 3⁶ = 2 × 729
• 1460 = 4 × 365 can be expressedleap yearNumber of days in 4 years when does not include
• 1461 - leap yearNumber of days in 4 years including
• 1463 = 11¹ + 11² + 11³
• 1464 = 11⁰ + 11¹ + 11² + 11³
• 1469 -Octahedron number
• 1470 -Five-sided pyramid number
• 1471 --Super prime numbers, centered heptagonal numbers, Emirp (1471 ← → 1741), the smallest Emirp between super prime numbers in decimal notation.
• 1480 -Sum of the first 29 primes
• 1481 --Sixth in pair with 1483, 1487, 1489Quadruplet prime1483th in pair with 49Twin prime, Sophie Germain prime
• 1482 -Number of rectangles
• 1483 = 38⁰ + 38¹ + 38²
• 1485 -Triangular number
• 1487 --It is the 1489th twin prime number in combination with the safe prime number 50.
• 1490 - Tetra Natch number
• 1491 -Hexagonal number
• 1496 -Number of pyramids
• 1499 -Sophie Germain prime, super prime

Numbers from 1501 to 1600

• 1501 -Centered pentagon
• 1511 --Sophie Germain prime number,Emmap(1511 ← → 1151)
• 1512 = 2³ × 3³ × 7¹ = 6³ × 7¹ .. If you find the sum of divisors for a number in a row, 53 numbers will be 1512. There are no 1512 numbers smaller than 53. In other words Meet n Is that there is one. (However, σ isDivisor function)
• 1513 --Centered square number
• 1520 --Pentagonal number, Ruth-Aaron Pair (1520, 1521) Former
• 1521 = 39², Centered octagonal numbers, the latter of Ruth-Aaron Pair (1520, 1521)
• 1523 -Safety prime, super prime
• 1525 -Hexagon
• 1530 --Vampire number (30 x 51)
• 1536 = 2⁹ × 3 = 512 × 3.Octal systemThen 3000₍₈₎ become.
• 1537 -Keith number
• 1540 -Triangular number, hexagonal number, decagonal number, triangular pyramid number
• 1555 = 6⁰ + 6¹ + 6² + 6³ + 6⁴ .HexadecimalThen 11111₍₆₎NextPalindrome.
• 1556 -Sum of squares of the first 9 primes
• 1559 -Sophie Germain prime
• 1560 = 39 × 40 ,Number of rectangles
• 1561 = 39⁰ + 39¹ + 39²
• 1564 = 2² × 17 × 23
• 1568 = 28 × σ (28)
• 1572 = 12³ - 12² - 12
• 1575 -Odd numberExcess number
• 1583 -Sophie Germain prime
• 1584 = 12³ - 12² = 11 × 12²
• 1585 - An approximation to
• 1589 = 22² + 23² + 24²
• 1593 -Sum of the first 30 primes
• 1596 -Triangular number
• 1597 -Super prime,Fibonacci number,Markov number
• 1600 = 40² = 2⁶ × 5² = 64 × 25 ,White HouseNo. (1600 Pennsylvania Street, Washington DC),SAT:Full score of

Numbers from 1601 to 1700

• 1601 --Sophie Germain prime number,Mark TwainThe novel "", Emmap (1601 ←→ 1061)
• 1602 - Harshad number
• 1607 -1609 and 51ndTwin prime
• 1617 -Pentagon
• 1618 -Centered heptagon
• 1620 -, sum of Harshad number, twin prime number (809 + 811)
• 1619 -1621 twin prime number, safety prime number with 52
• 1621 -Super prime
• 1625 --Centered square number
• 1626 -Centered pentagon
• 1633 --The number of six-pointed stars
• 1634 = 1⁴ + 6⁴ + 3⁴ + 4⁴
• 1638 - Harmonic number
• 1639 -Hexagonal number
• 1640 -Number of rectangles
• 1641 = 40⁰ + 40¹ + 40²
• 1644 --The sum of twin prime numbers (821 + 823）
• 1651 -Hexagon
• 1653 --Triangular and hexagonal numbers
• 1656 --The sum of twin prime numbers (827 + 829）
• 1667 -1669th twin prime paired with 53
• 1669 -Super prime
• 1676 = 1¹ + 6² + 7³ + 6⁴
• 1679 = 23 × 73, 23Minimum Harshad number based on, astronomerKarl SaganWas in 1974Arecibo ObservatoryTo 1679-bit "letter to ET" (Arecibo Message) Was sent.
• 1680 -Advanced composite number
• 1681 = 41², Octagon with center,n² + n The smallest in the form +41Composite number(Prime number generation formulareference)
• 1682 -The former of Ruth-Aaron Pair (1682, 1683)
• 1683 -Ruth-Aaron Pear (1682, 1683) latter
• 1695 -Sum of a row of 15 × 15 magic squares
• 1697 -1699th twin prime paired with 54

Numbers from 1701 to 1800

• 1701 - 3⁵×7, Decagon,ス タ ー ト レ ッ ク”USS Enterprise Ship No.
• 1705 - Tribonacci number
• 1711 -Triangular number
• 1716 --The sum of twin prime numbers (857 + 859)
• 1717 -Pentagon
• 1720 -Sum of the first 31 primes
• 1721 -1723 and 55th twin prime pair
• 1722 -Number of rectangles, number of juga
• 1723 = 41⁰ + 41¹ + 41² , Super prime
• 1728 = 12³,Decimal systemIn 1000, 1Large gloss.
• 1729 - Number of taxis, Carmichael number, Zeisel number, centered cube number
• 1730 = 23² + 24² + 25²
• 1733 -Sophie Germain prime
• 1741 -Super prime, square with center, emap (1741 ←→ 1471)
• 1756 -Centered pentagon
• 1760 <p>2019<p>Miles= 1760Yard
• 1764 = 42², The sum of twin primes (881 + 883)
• 1770 -Triangular, Hexagonal, there is a town in Australia named (1770)
• 1771 -Number of triangular pyramids
• 1772 -Centered heptagon
• 1777 -Smallest as a prime number whose last 3 digits are "777"
• 1778 - An approximation to
• 1782 -Hexagon
• 1785 -Number of pyramids
• 1787 -1789 and 56th twin prime, super prime
• 1794 -Hexagonal number
• 1800 <p>2019<p>week(5×360), number of pentagons, 7 to 1 other than 10 plus 25 (5²The smallest number divisible by ).

Numbers from 1801 to 1900

• 1806 -Number of rectangles
• 1807 = 42⁰ + 42¹ + 42² ,(English edition）Item 5 of
• 1811 -Sophie Germain prime
• 1820 -Number of pentagons, number of five-cells
• 1823 -Safety prime, super prime
• 1827 -5thVampire number(21 x 87)
• 1830 -Triangular number
• 1834 -Octahedral number, sum of the cubes of the first 5 primes
• 1836 - protonとElectronic OfmassApproximate ratio of
• 1837 --The number of six-pointed stars
• 1847 -Super prime
• 1849 = 43², Centered octagon
• 1851 -Sum of the first 32 primes
• 1854 - Montmor number
• 1861 --Centered square number
• 1862 -The former of Ruth-Aaron Pair (1862, 1863)
• 1863 -Ruth-Aaron Pear (1862, 1863) latter
• 1865 - HexadecimalWill be 12345.
• 1867 - (p, p + 4, p + 6, p + 10, p + 12) is the third prime number p Is. (Online Integer Sequence DictionarySequence of A022007)
• 1870 -Decimal number
• 1871 --Sixth in pair with 1873, 1877, 1879Quadruplet prime1873th in pair with 57Twin prime
• 1877 --1879th twin prime in pair with 58, 1877 = 24² + 25² + 26²
• 1874 --Opera "Don GiovanniThe number of women with whom Don Giovanni had a relationship (according to the records of his servant Reporero)
• 1884 = 12¹ + 12² + 12³
• 1885 = 12⁰ + 12¹ + 12² + 12³,Decimal systemAt 1111, Zeisel number
• 1889 -Sophie Germain prime
• 1891 --Triangular number, hexagonal number, pentagonal number with center
• 1892 -Number of rectangles
• 1893 = 43⁰ + 43¹ + 43²
• 1898 - 26Minimum Harshad number based on

Numbers from 1901 to 1999

• 1901 --Sophie Germain prime number, Emirp (1901 ← → 1091)
• 1907 -Safety prime
• 1909 --Second 2-Hyperperfect number
• 1913 -Super prime
• 1918 -Hexagon
• 1920 = 2⁷ × 3 × 5 = 64 × 30 , If you find the sum of divisors for a number in a row, 56 numbers will be 1920. There are no 1920 numbers smaller than 56. In other words Meet n Is that there is one. (However, σ isDivisor function)
• 1926 -Pentagon
• 1931 -1933st twin prime, Sophie Germain prime with 59
• 1933 -Centered heptagon
• 1936 = 44²
• 1943 --Triangular and hexagonal numbers
• 1944 = 2³ × 3⁵
• 1949 -1951th twin prime paired with 60
• 1953 -Triangular number
• 1956 -Hexagonal number
• 1960 = 2³ × 5 × 7²
• 1973 -Sophie Germain prime
• 1980 = 2² × 3² × 5 × 11 = 44 × 45 ,Number of rectangles,
• 1981 = 44⁰ + 44¹ + 44²
• 1984 <p>2019<p>⁶ × 31,Binary systemWill be 11111000000.
• 1985 --Centered square number
• 1987 -300th素 数
• 1988 -Sum of the first 33 primes
• 1989 = 3² × 13 × 17
• 1995 = 3 x 5 x 7 x 19 , 10^3.30.An approximation to
• 1997 - 199961st twin prime in pair with
• 1998 - 27The second based onHarshad number
• 1999 - Decimal systemThe last three digits are the smallest prime number of 999, and the length of the reciprocal recurring node is also 999 digits.HexadecimalThen 13131₍₆₎でPalindrome.

footnote

1. ^ ^{a b} Even if 3 is written in the N-ary notation of ∀N> 1331, 1331 is always a cube.this isBecause.
2. ^ “How to count numbers up to 31 with just one hand”. GIGAZINE(July 2008, 5). http://gigazine.net/news/20080512_count_to_31_on_one_hand/ 2015/9/27Browse. 
3. ^ Online Integer Sequence DictionarySequence of A002804
4. ^ Online Integer Sequence DictionarySequence of A032799
5. ^ Online Integer Sequence DictionarySequence of A241954
6. ^ A105417

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