# 257

This number is a prime.

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The largest prime in a sequence of fifteen primes of the form 2*t*+ 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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