31
This number is a prime.
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3 + 5 + 7 + 11 + ... + 89 = 312, and the sum of the first 31 odd primes is a prime square.
Submitted: 1999-09-02 23:40:00; Last Modified: 2009-02-16 02:35:41.
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell