Template:HAZMAT Class 6 Packing Group Hazard Zone Not Inhaling Vapors

30,000 (thirty thousand) is the natural number that comes after 29,999 and before 30,001.

Selected numbers

• 30000 – round number
• 30029 – primorial prime
• 30030 – primorial
• 30240 – harmonic divisor number
• 30420 – pentagonal pyramidal number
• 30694 – open meandric number
• 30941 – first base 13 repunit prime
• 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 – $181^2$, centered hexagonal number
• 32767 – $2^{15}-1$, largest positive value for a signed (two's complement) 16-bit integer on a computer.
• 32768 – $2^{15}$, 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
• 34560 – 5 superfactorial
• 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
• 35964 – digit-reassembly 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

References

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