Selected numbers

• 30000 – round number
• 30029 – primorial prime
  Primorial prime
  In mathematics, primorial primes are prime numbers of the form pn# ± 1, where:The first few primorial primes are, the largest known primorial prime is 843301# - 1 with 365,851 digits, found in 2010 by the PrimeGrid project....
  
  
• 30030 – primorial
  Primorial
  In mathematics, and more particularly in number theory, primorial is a function from natural numbers to natural numbers similar to the factorial function, but rather than multiplying successive positive integers, only successive prime numbers are multiplied...
  
  
• 30240 – harmonic divisor number
• 30420 – pentagonal pyramidal number
• 30694 – open meandric number
• 31116 – octahedral number
• 31337 – cousin prime
  Cousin prime
  In mathematics, cousin primes are prime numbers that differ by four; compare this with twin primes, pairs of prime numbers that differ by two, and sexy primes, pairs of prime numbers that differ by six....
  
  , pronounced elite, an alternate way to spell 1337
  Leet
  Leet , also known as eleet or leetspeak, is an alternative alphabet for the English language that is used primarily on the Internet. It uses various combinations of ASCII characters to replace Latinate letters...
  
  , an obfuscated alphabet made with numbers and punctuation, known and used in the gamer
  Gamer
  Historically, the term "gamer" usually referred to someone who played role-playing games and wargames. Since they became very popular, the term has included players of video games...
  
  , hacker and BBS
  Bulletin board system
  A Bulletin Board System, or BBS, is a computer system running software that allows users to connect and log in to the system using a terminal program. Once logged in, a user can perform functions such as uploading and downloading software and data, reading news and bulletins, and exchanging...
  
   cultures.
• 31395 – square pyramidal number
• 31397 – prime number followed by primal prime gap of 72.
• 31929 – Zeisel number
• 32043 – smallest number whose square (algebra) is pandigital
  Pandigital
  Pandigital is a digital photo-frame manufacturer founded in 1998 that has recently began to expand its product line to include e-reader, tablets and e-books....
  
  .
• 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
  Centered hexagonal number
  A centered hexagonal number, or hex number, is a centered figurate number that represents a hexagon with a dot in the center and all other dots surrounding the center dot in a hexagonal lattice....
  
  
• 32767 – , largest positive value for a signed (two's complement
  Two's complement
  The two's complement of a binary number is defined as the value obtained by subtracting the number from a large power of two...
  
  ) 16-bit integer on a computer
  Integer (computer science)
  In computer science, an integer is a datum of integral data type, a data type which represents some finite subset of the mathematical integers. Integral data types may be of different sizes and may or may not be allowed to contain negative values....
  
  .
• 32768 – , maximum absolute value
  Absolute value
  In mathematics, the absolute value |a| of a real number a is the numerical value of a without regard to its sign. So, for example, the absolute value of 3 is 3, and the absolute value of -3 is also 3...
  
   of a negative value for a signed (two's complement
  Two's complement
  The two's complement of a binary number is defined as the value obtained by subtracting the number from a large power of two...
  
  ) 16-bit integer on a computer
  Integer (computer science)
  In computer science, an integer is a datum of integral data type, a data type which represents some finite subset of the mathematical integers. Integral data types may be of different sizes and may or may not be allowed to contain negative values....
  
  .
• 32800 – pentagonal pyramidal number
• 32993 – Leyland number
• 33461 – Pell number, Markov number
• 33511 – square pyramidal number
• 33781 – octahedral number
• 34483 – cousin prime
  Cousin prime
  In mathematics, cousin primes are prime numbers that differ by four; compare this with twin primes, pairs of prime numbers that differ by two, and sexy primes, pairs of prime numbers that differ by six....
  
  , strong prime
  Strong prime
  In mathematics, a strong prime is a prime number with certain special properties. The definitions of strong primes are different in cryptography and number theory.- Definition in cryptography :...
  
  
• 34487 – cousin prime
• 34499 – twin prime
• 34501 – twin prime
• 35720 – square pyramidal number
• 35840 – number of ounce
  Ounce
  The ounce is a unit of mass with several definitions, the most commonly used of which are equal to approximately 28 grams. The ounce is used in a number of different systems, including various systems of mass that form part of the imperial and United States customary systems...
  
  s in a long ton
  Long ton
  Long ton is the name for the unit called the "ton" in the avoirdupois or Imperial system of measurements, as used in the United Kingdom and several other Commonwealth countries. It has been mostly replaced by the tonne, and in the United States by the short ton...
  
   (2,240 pounds
  Pound (mass)
  The pound or pound-mass is a unit of mass used in the Imperial, United States customary and other systems of measurement...
  
  )
• 35890 – tribonacci number
• 35899 – alternating factorial
  Alternating factorial
  In mathematics, an alternating factorial is the absolute value of the alternating sum of the first n factorials.This is the same as their sum, with the odd-indexed factorials multiplied by −1 if n is even, and the even-indexed factorials multiplied by −1 if n is odd, resulting in an...
  
  
• 35937 – chiliagonal number
• 36100 – sum of the cubes of the first 19 positive integers
• 36594 – octahedral number
• 37378 – semi-meandric number
• 37666 – Markov number
  Markov number
  A Markov number or Markoff number is a positive integer x, y or z that is part of a solution to the Markov Diophantine equationx^2 + y^2 + z^2 = 3xyz,\,studied by .The first few Markov numbers are...
  
  
• 37926 – pentagonal pyramidal number
• 38024 – square pyramidal number
• 38962 – Kaprekar number
  Kaprekar number
  In mathematics, a Kaprekar number for a given base is a non-negative integer, the representation of whose square in that base can be split into two parts that add up to the original number again. For instance, 45 is a Kaprekar number, because 45² = 2025 and 20+25 = 45. The Kaprekar numbers are...
  
  
• 39559 – octahedral number
• 39648 – tetranacci number