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Search: id:A056006
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| A056006 |
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Numbers n such that n | Sigma(n) + 2. |
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+0
1
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OFFSET
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1,2
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COMMENT
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n | Sigma(n) gives the multi-perfect numbers A007691, n | Sigma(n) +1 if n is a power of 2 A000079.
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MATHEMATICA
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Do[If[Mod[DivisorSigma[1, n]+2, n]==0, Print[n]], {n, 1, 7*10^8}]
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CROSSREFS
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Cf. A045768.
Sequence in context: A034945 A132480 A074260 this_sequence A067999 A119035 A004100
Adjacent sequences: A056003 A056004 A056005 this_sequence A056007 A056008 A056009
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KEYWORD
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easy,nonn
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AUTHOR
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Robert G. Wilson v (rgwv(AT)rgwv.com), Jul 24 2000
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