257

This number is a prime.

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The largest prime in a sequence of fifteen primes of the form 2t + 17, where t runs through the first fifteen triangular numbers, i.e., positive integers of the form n(n + 1)/2. [Silva]

Submitted: 2006-12-22 11:14:02;   Last Modified: 2008-07-31 11:54:27.
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