# 9

This number is a composite.

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The smallest composite number n such that both
2^{n}+n and 2

^{n}-n are prime. That is, 2

^{9}+9 = 521 and 2

^{9}-9 = 503 are prime. [Poo Sung]

Submitted: 2009-06-03 02:02:59; Last Modified: 2009-06-03 05:56:56.

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