106721

This number is a prime.

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106721 = 1^15 + 3^10 + 6^6 + 10^3 + 15^1. Note the first five triangular numbers in ascending order as bases and descending order as powers. [Silva]

Submitted: 2009-09-20 01:12:38; Last Modified: 2009-09-20 01:19:21.