61

This number is a prime.

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If we sum the last digits of the numbers up to 61 raised to the power of zerro or bigger, we always yield primes (61, 271 or 199). 61 is the smallest number with this property. If we sum the last digits of the first 61 numbers n raised to the power of n, the result is prime again (283). [Petrov]

Submitted: 2019-04-23 03:35:11;   Last Modified: 2019-04-23 06:33:33.
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