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 20:06:36; Last Modified: 2018-04-08 21:15:10.
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