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 17:28:37; Last Modified: 2018-04-04 19:13:36.
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