Numbers n such that sigma(n+1)=2*sigma(n).
5, 125, 1253, 1673, 3127, 5191, 7615, 12035, 43817, 47795, 48559, 49955, 56975
2 seqfan posts
Fri Oct 1 07:43:36 CEST 2010 [seqfan] Re: A067081: All terms odd?
Fri Oct 1 07:16:43 CEST 2010 [seqfan] A067081: All terms odd?
Index of A-numbers in seqfan: by ascending order
by month
by frequency
by keyword
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