23

This number is a prime.

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2+3+5+7+11+13+17+23=100=10^2. Probably no other sum of the first k primes will produce another power of 10. Note the first case is 2+3+5=10^1. [Rivera]

Submitted: 2020-06-06 08:30:28;   Last Modified: 2020-06-06 08:56:28.
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