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Search: id:A048884
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| A048884 |
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Numbers n such that sigma(n) - n = n - pi(n) - 1 where pi(n) is A000720. |
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+0
1
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| 1, 5, 9, 26, 236, 244, 4862, 5396, 6868, 9608, 9704, 23764, 82665, 733064, 25881904, 25886864, 33299110, 261851668
(list; graph; listen)
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OFFSET
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1,2
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MATHEMATICA
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For[i = 1, i < 1000000000000, i++, If[DivisorSigma[1, i] - i == i - PrimePi[i] - 1, Print[i]]; ]; - Sam Handler (sam_5_5_5_0(AT)yahoo.com), Aug 29 2006
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CROSSREFS
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Cf. A037172.
Sequence in context: A112084 A038251 A034498 this_sequence A077915 A026587 A147367
Adjacent sequences: A048881 A048882 A048883 this_sequence A048885 A048886 A048887
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KEYWORD
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more,nonn
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AUTHOR
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Naohiro Nomoto (6284968128(AT)geocities.co.jp)
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EXTENSIONS
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More terms from Sam Handler (sam_5_5_5_0(AT)yahoo.com), Aug 29 2006
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