1361

This number is a prime.

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The sum of the first thirteen terms in the Lucas sequence. Note that 1 + 3 + 4 + 7 + 11 + 18 + 29 + 47 + 76 + 123 + 199 + 322 + 521 = 1361. [Schiffman]

Submitted: 2010-12-30 20:45:04; Last Modified: 2011-01-15 14:57:17.