30,000

List of numbers Integers
Cardinal
Ordinal	30 000th ()
Factorization
Greek numeral
Roman numeral
Binary
Ternary
Senary
Octal
Duodecimal
Hexadecimal

30000 (thirty thousand) 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 prime
• 30030 = primorial
• 30031 = smallest composite number which is one more than a primorial
• 30203 = safe prime
• 30240 = harmonic divisor number
• 30323 = Sophie Germain prime and safe prime
• 30420 = pentagonal pyramidal number
• 30537 = Riordan number
• 30694 = open meandric number
• 30941 = first base 13 repunit prime

31000 to 31999

• 31116 = octahedral number
• 31185 = number of partitions of 39
• 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 greater than 52
• 31688 = the number of years approximately equal to 1 trillion seconds
• 31721 = start of a prime quadruplet
• 31929 = 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 number
• 32761 = 181², centered hexagonal number
• 32767 = 2¹⁵ − 1, largest positive value for a signed (two's complement) 16-bit integer on a computer.
• 32768 = 2¹⁵ = 8⁵ = 32³, 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 prime using 2 & 15 (2¹⁵ + 15²)

33000 to 33999

• 33333 = repdigit
• 33461 = Pell number, Markov number
• 33511 = square pyramidal number
• 33781 = octahedral number

34000 to 34999

• 34560 = 5 superfactorial
• 34790 = number of non-isomorphic set-systems of weight 13.
• 34841 = start of a prime quadruplet
• 34969 = favorite number of the Muppet character Count von Count

35000 to 35999

• 35720 = square pyramidal number
• 35840 = number of ounces in a long ton (2,240 pounds)
• 35890 = tribonacci number
• 35899 = alternating factorial
• 35937 = 33³, chiliagonal number
• 35964 = digit-reassembly number

36000 to 36999

• 36100 = sum of the cubes of the first 19 positive integers
• 36463 – number of parallelogram polyominoes with 14 cells
• 36594 = octahedral number

37000 to 37999

• 37338 = number of partitions of 40
• 37378 = semi-meandric number
• 37634 = third term of the Lucas–Lehmer sequence
• 37666 = Markov number
• 37926 = pentagonal pyramidal number

38000 to 38999

• 38024 = square pyramidal number
• 38209 = n such that n | (3ⁿ + 5)
• 38305 = the largest Forges-compatible number (for index 32) to the field $\mathbb {Q} ({\sqrt {6}},{\sqrt {14}})$. But a conjecture of Viggo Brun predicts that there are infinitely many such numbers for any Galois field $F$ unless $F$ is bad.
• 38416 = 14⁴
• 38501 = 7⁴ + 190²: Friedlander-Iwaniec prime. Smallest prime separated by at least 40 from the nearest primes (38461 and 38543). 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 numbers
• 38962 = Kaprekar number

39000 to 39999

• 39299 = Integer connected with coefficients in expansion of Weierstrass P-function
• 39304 = 34³
• 39559 = octahedral number
• 39648 = tetranacci number

Primes

There are 958 prime numbers between 30000 and 40000.