9000 (number)

Selected numbers in the range 9001–9999

9001 to 9099

• 9001 – sexy prime with 9007
• 9007 – sexy prime with 9001
• 9009 – centered cube number
• 9025 = 95², centered octagonal number
• 9029 – Sophie Germain prime
• 9041 – super-prime
• 9045 – triangular number
• 9059 – Sophie Germain prime
• 9072 – decagonal number
• 9077 – Markov number
• 9091 – unique prime

  9100 to 9199

• 9103 – super-prime
• 9126 – pentagonal pyramidal number
• 9139 – tetrahedral number
• 9175 – smallest generalized Sierpiński number in base 10: is always divisible by one of the prime numbers.
• 9180 – triangular number

  9200 to 9299

• 9216 = 96²
• 9221 – Sophie Germain prime
• 9224 – octahedral number
• 9232 — Peak of 27 in Collatz Conjecture.
• 9241 – cuban prime of the form x = y + 1
• 9261 = 21³, largest 4 digit perfect cube
• 9272 – weird number
• 9283 – centered heptagonal number
• 9293 – Sophie Germain prime, super-prime

  9300 to 9399

• 9316 – triangular number
• 9319 – super-prime
• 9334 – nonagonal number
• 9349 – Lucas prime, Fibonacci number
• 9361 - star number
• 9371 – Sophie Germain prime
• 9376 – 1-automorphic number
• 9397 – balanced prime

  9400 to 9499

• 9403 – super-prime
• 9409 = 97², centered octagonal number
• 9419 – Sophie Germain prime
• 9439 – completes the twelfth prime quadruplet set
• 9453 – triangular number
• 9455 – square pyramidal number
• 9457 – decagonal number
• 9461 – super-prime, twin prime
• 9467 – safe prime
• 9473 – Sophie Germain prime, balanced prime, Proth prime
• 9474 – Narcissistic number in base 10
• 9479 – Sophie Germain prime
• 9496 – Telephone/involution number

  9500 to 9599

• 9511 - prime number
• 9521 - prime number
• 9533 - prime number
• 9539 – Sophie Germain prime, super-prime
• 9551 – first prime followed by as many as 35 consecutive composite numbers
• 9587 – safe prime, follows 35 consecutive composite numbers
• 9591 – triangular number
• 9592 - the number of primes under 100,000

  9600 to 9699

• 9601 – Proth prime
• 9604 = 98²
• 9619 – super-prime
• 9629 – Sophie Germain prime
• 9647 – centered heptagonal number
• 9661 – super-prime, sum of nine consecutive primes
• 9689 – Sophie Germain prime
• 9699 – nonagonal number

  9700 to 9799

• 9721 – prime of the form 2p-1
• 9730 – triangular number
• 9739 – super-prime
• 9743 – safe prime
• 9791 – Sophie Germain prime

  9800 to 9899

• 9800 – member of a Ruth-Aaron pair with 9801
• 9801 = 99², the largest 4 digit perfect square, centered octagonal number, square pentagonal number, member of a Ruth-Aaron pair with 9800
• 9833 – super-prime
• 9839 – safe prime
• 9841 - star number
• 9850 – decagonal number
• 9857 – Proth prime
• 9859 – super-prime
• 9870 – triangular number
• 9871 – balanced prime
• 9880 – tetrahedral number
• 9887 – safe prime

  9900 to 9999

• 9901 – unique prime, sum of seven consecutive primes
• 9905 – number of compositions of 16 whose run-lengths are either weakly increasing or weakly decreasing
• 9923 – super-prime, probably smallest certainly executable prime number on x86 MS-DOS
• 9949 – sum of nine consecutive primes
• 9973 – super-prime
• 9988 – number of prime knots with 13 crossings
• 9999 – Kaprekar number, repdigit

  Prime numbers