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A006521 Numbers n such that n divides 2^n + 1.
(Formerly M2806)
+0
15
1, 3, 9, 27, 81, 171, 243, 513, 729, 1539, 2187, 3249, 4617, 6561, 9747, 13203, 13851, 19683, 29241, 39609, 41553, 59049, 61731, 87723, 97641, 118827, 124659, 177147, 185193, 250857, 263169, 292923, 354537, 356481, 373977, 531441, 555579, 752571 (list; graph; listen)
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Last modified December 6 13:45 EST 2009. Contains 170429 sequences.


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