References to A005820

3-perfect (triply perfect, tri-perfect, triperfect or sous-double) numbers: sum of divisors of n is 3n.
120, 672, 523776, 459818240, 1476304896, 5100118016

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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