131

This number is a prime.

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131 = (1^0+3^0+1^0) + (1^1+3^1+1^1) + (1^2+3^2+1^2) + (1^3+3^3+1^3) + (1^4+3^4+1^4). Note that the summands are all primes. [Silva]

Submitted: 2008-01-13 19:12:24; Last Modified: 2008-01-30 17:28:00.