7

This number is a prime.

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The sum of all n^k with n + k = 7, i.e., 1^6 + 2^5 + 3^4 + 4^3 + 5^2 + 6^1 + 7^0, = 7#. [Bergot]

Submitted: 2018-04-04 12:28:37;   Last Modified: 2018-04-04 14:13:36.
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