**Numbers n such that n divides 2^n + 1.**

*1, 3, 9, 27, 81, 171, 243, 513, 729, 1539, 2187, 3249, 4617, 6561, 9747, 13203*

*2 seqfan posts*

Index of A-numbers in seqfan: by ascending order by month by frequency by keyword

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