17

This number is a prime.

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From the sum of the first n primes one notices that from n = 2*17 to 2*21, all five end with the digit 7; the same as 17. The sums are 2127, 2427, 2747, 3087, 3447. [Bergot]

Submitted: 2018-04-08 15:06:36;   Last Modified: 2018-04-08 16:15:10.
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