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 12:29:37; Last Modified: 2009-06-30 17:47:34.
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