Selected Numbers
- 30000 – round number
- 30029 – primorial prime
- 30030 – primorial
- 30240 – harmonic divisor number
- 30420 – pentagonal pyramidal number
- 30694 – open meandric number
- 31116 – octahedral number
- 31337 – 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 number
- 31397 – prime number followed by a record prime gap of 72, the first above 52
- 31721 – start of a prime quadruplet
- 31929 – Zeisel number
- 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 number
- 32761 –, centered hexagonal number
- 32767 –, largest positive value for a signed (two's complement) 16-bit integer on a computer.
- 32768 –, maximum absolute value of a negative value for a signed (two's complement) 16-bit integer on a computer.
- 32800 – pentagonal pyramidal number
- 32993 – Leyland number
- 33461 – Pell number, Markov number
- 33511 – square pyramidal number
- 33781 – octahedral number
- 34841 – start of a prime quadruplet
- 34969 – favorite number of the Muppet character Count von Count
- 35720 – square pyramidal number
- 35840 – number of ounces in a long ton (2,240 pounds)
- 35890 – tribonacci number
- 35899 – alternating factorial
- 35937 – chiliagonal number
- 36100 – sum of the cubes of the first 19 positive integers
- 36594 – octahedral number
- 37378 – semi-meandric number
- 37666 – Markov number
- 37926 – pentagonal pyramidal number
- 38024 – square pyramidal number
- 38962 – Kaprekar number
- 39559 – octahedral number
- 39648 – tetranacci number
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