821

This number is a prime.

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Smallest multidigit prime partial sum of number of planar graphs with minimum degree at least 1 and n nodes. Also largest known prime of its form: 0 + 1 + 2 + 7 + 22 + 109 + 680 = 821 is prime. [Post]

Submitted: 2010-03-23 22:55:14; Last Modified: 2010-03-24 01:36:48.