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Search: id:A156943
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| A156943 |
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Odd numbers not congruent to 25 whose abundancy is odd. |
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+0
2
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| 81162081, 138791961, 173369889, 441882441, 730458729, 1091179089, 1249127649, 1524043521, 1560329001, 1744649361, 2286465489, 2606204601, 3255501249, 3976941969, 4770526761, 5567099769, 6574128561, 6800806089, 7584145569
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Number of terms <10^n: 0, 0, 0, 0, 0, 0, 0, 1, 5, 25, 63, ..., .
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LINKS
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R. G. Wilson v, Table of n, a(n) for n=1,...,1005
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MATHEMATICA
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f[n_] := DivisorSigma[1, n] - 2 n; Select[ Range[1, 7775536039, 2], Mod[f@#, 2]!=5 f@# > 0 &]
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CROSSREFS
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Cf. A156903, A156942.
Sequence in context: A053431 A119075 A136965 this_sequence A120316 A118079 A115534
Adjacent sequences: A156940 A156941 A156942 this_sequence A156944 A156945 A156946
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KEYWORD
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nonn
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AUTHOR
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Robert G. Wilson v (rgwv(AT)rgwv.com), Feb 18 2009
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