29

This number is a prime.

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29 + 2*Hn (where Hn stands for the n-th centered hexagonal number) yields 30 primes for n = 0 to 29. Recall that 29 + 2*n^2 (i.e., twice the n-th square number) yields 29 primes for n = 0 to 28. [Petrov]

Submitted: 2019-02-06 05:27:47;   Last Modified: 2019-02-06 06:36:37.
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