216

This number is a composite.

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Zhi-Wei Sun conjectured in March 2008 that 216 is the only number not of the form p + k(k+1)/2, with p = 0 or p prime. [Hasler]

Submitted: 2008-03-24 14:22:06;   Last Modified: 2008-04-02 22:08:22.
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