References to A045768

Numbers n such that sigma(n) == 2 (mod n).
1, 20, 104, 464, 650, 1952, 130304, 522752, 8382464, 134193152, 54975424102


2 seqfan posts

Wed Nov 3 22:15:01 CET 2010    [seqfan] Re: Near-perfect numbers
Mon Nov 1 19:06:41 CET 2010    [seqfan] Near-perfect numbers

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