6000 (six thousand) is the natural number following 5999 and preceding 6001.
Selected numbers in the range 6001-6999
- 6025 - Rhythm guitarist of the Dead Kennedys from June 1978 to March 1979. Full name is Carlos Cadona.
- 6028 - centered heptagonal number
- 6047 - safe prime
- 6053 - Sophie Germain prime
- 6069 - nonagonal number
- 6073 - balanced prime
- 6084 - 782, sum of the cubes of the first twelve integers
- 6089 - highly cototient number
- 6095 - magic constant of n×n normal magic square and n-Queens Problem for n = 23.
- 6101 - Sophie Germain prime
- 6105 - triangular number
- 6113 - Sophie Germain prime
- 6131 - Sophie Germain prime
- 6143 - Thabit number
- 6173 - Sophie Germain prime
- 6174 - Kaprekar's constant
- 6181 - octahedral number
- 6200 - harmonic divisor number
- 6201 - square pyramidal number
- 6211 - cuban prime of the form x = y + 1
- 6216 - triangular number
- 6232 - amicable number with 6368
- 6241 - 792, centered octagonal number
- 6250 - Leyland number
- 6263 - Sophie Germain prime, balanced prime
- 6269 - Sophie Germain prime
- 6280 - decagonal number
- 6317 - balanced prime
- 6322 - centered heptagonal number
- 6323 - Sophie Germain prime, balanced prime
- 6328 - triangular number
- 6348 - pentagonal pyramidal number
- 6364 - nonagonal number
- 6367 - balanced prime
- 6368 - amicable number with 6232
- 6373 - balanced prime
- 6399 - smallest integer that can't be expressed as a sum of fewer than 279 eighth powers
- 6400 - 802
- 6408 - sum of the squares of the first thirteen primes
- 6441 - triangular number
- 6449 - Sophie Germain prime
- 6466 - Markov number
- 6491 - Sophie Germain prime
- 6509 - highly cototient number
- 6521 - Sophie Germain prime
- 6545 - tetrahedral number
- 6551 - Sophie Germain prime
- 6555 - triangular number
- 6556 - member of a Ruth-Aaron pair with 6557 (first definition)
- 6557 - member of a Ruth-Aaron pair with 6556 (first definition)
- 6561 - 38, 812, perfect totient number, centered octagonal number
- 6599 - safe prime
- 6563 - Sophie Germain prime
- 6581 - Sophie Germain prime
- 6601 - Carmichael number, decagonal number
- 6623 - centered heptagonal number
- 6659 - safe prime
- 6666 - nonagonal number
- 6670 - triangular number
- 6719 - safe prime, highly cototient number
- 6724 - 822
- 6728 - number of domino tilings of a 6×6 checkerboard
- 6761 - Sophie Germain prime
- 6765 - Fibonacci number
- 6779 - safe prime
- 6811 - member of a Ruth-Aaron pair with 6812 (first definition)
- 6812 - member of a Ruth-Aaron pair with 6811 (first definition)
- 6827 - safe prime
- 6863 - balanced prime
- 6876 - triangular number
- 6880 - vampire number
- 6889 - 832, centered octagonal number
- 6899 - Sophie Germain prime, safe prime
- 6903 - triangular number
- 6924 - magic constant of n×n normal magic square and n-Queens Problem for n = 24.
- 6929 - highly cototient number
- 6930 - decagonal number, square pyramidal number
- 6931 - centered heptagonal number
- 6975 - nonagonal number
- 6977 - balanced prime
- 6983 - Sophie Germain prime, safe prime
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