5

This number is a prime.

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The largest Pell number (coincidentally prime) of the form x2 + 1. Note that 5 = 22 + 1, where 1 and 2 are the two other Pell numbers of this form. [Capelle]

Submitted: 2009-06-30 07:29:37;   Last Modified: 2009-06-30 12:47:34.
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