17

This number is a prime.

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Prime Numbers CD Image J. Neptune © 1994

"The prime number 17 accommodates all the positive-negative, quanta-wave primes up to and including the number 18, which in turn accommodates the two nines of the invisible twoness of all systems." (Quoted from from Section 1238.43 of Synergetics by R. Buckminster Fuller.) [Croll]