13

This number is a prime.

Single Curio View:   (Seek other curios for this number)
The only prime subscript of a triangular number that is also a square pyramidal number : 1 + 2 + 3 + ... + 11 + 12 + 13 = 12 + 22 + 32 + 42 + 52 + 62. [Beedassy]

Submitted: 2008-10-18 17:11:48;   Last Modified: 2008-10-18 18:38:01.
Printed from the PrimePages <primes.utm.edu> © G. L. Honaker and Chris K. Caldwell