30,000
30,000 is the natural number that comes after 29,999 and before 30,001.
Selected numbers in the range 30001–39999
30001 to 30999
30029 = primorial prime30030 = primorial30031 = smallest composite number which is one more than a primorial30203 = safe prime30240 = harmonic divisor number, smallest 4-perfect number30323 = Sophie Germain prime and safe prime30420 = pentagonal pyramidal number30537 = Riordan number30694 = open meandric number30941 = first base 13 repunit prime
31000 to 31999
31116 = octahedral number31185 = number of partitions of 3931337 = cousin prime, pronounced elite, an alternate way to spell 1337, an obfuscated alphabet made with numbers and punctuation, known and used in the gamer, hacker, and BBS cultures.31395 = square pyramidal number31397 = prime number followed by a record prime gap of 72, the first greater than 5231688 = the number of years approximately equal to 1 trillion seconds31721 = start of a prime quadruplet31929 = Zeisel number
32000 to 32999
32043 = smallest number whose square is pandigital.32045 = can be expressed as a sum of two squares in more ways than any smaller number.32760 = harmonic divisor number32761 = 1812, centered hexagonal number32767 = 215 − 1, largest positive value for a signed 16-bit integer on a computer.32768 = 215 = 85 = 323, maximum absolute value of a negative value for a signed 16-bit integer on a computer.32800 = pentagonal pyramidal number32993 = Leyland prime using 2 & 15
33000 to 33999
33333 = repdigit33461 = Pell number, Markov number33511 = square pyramidal number33781 = octahedral number
34000 to 34999
34560 = 5 superfactorial34790 = number of non-isomorphic set-systems of weight 13.34841 = start of a prime quadruplet34969 = favorite number of the Muppet character Count von Count
35000 to 35999
35720 = square pyramidal number35840 = number of ounces in a long ton 35890 = tribonacci number35899 = alternating factorial35937 = 333, chiliagonal number35964 = digit-reassembly number
36000 to 36999
36100 = sum of the cubes of the first 19 positive integers36463 – number of parallelogram polyominoes with 14 cells36594 = octahedral number
37000 to 37999
37338 = number of partitions of 4037378 = semi-meandric number37634 = third term of the Lucas–Lehmer sequence37666 = Markov number37926 = pentagonal pyramidal number
38000 to 38999
38024 = square pyramidal number38209 = n such that n | 38305 = the largest Forges-compatible number to the field. But a conjecture of Viggo Brun predicts that there are infinitely many such numbers for any Galois field unless is bad.38416 = 14438501 = 74 + 1902: Friedlander-Iwaniec prime. Smallest prime separated by at least 40 from the nearest primes. It is thus an isolated prime. Chen prime.38807 = number of non-equivalent ways of expressing 10,000,000 as the sum of two prime numbers38962 = Kaprekar number
39000 to 39999
39299 = Integer connected with coefficients in expansion of Weierstrass P-function39304 = 34339559 = octahedral number39648 = tetranacci number
Primes
There are 958 prime numbers between 30,000 and 40,000.