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Search: id:A067718
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| A067718 |
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Numbers n such that sigma(2^n+1)==0 (mod n). |
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+0
1
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| 1, 2, 6, 12, 24, 36, 42, 70, 126, 132, 144, 168, 210, 225, 252
(list; graph; listen)
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OFFSET
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1,2
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PROGRAM
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(PARI) for(n=1, 260, if(sigma(2^n+1)%n==0, print1(n, ", "))) (Brockhaus)
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CROSSREFS
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Sequence in context: A137895 A099993 A011778 this_sequence A028923 A001116 A002336
Adjacent sequences: A067715 A067716 A067717 this_sequence A067719 A067720 A067721
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KEYWORD
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nonn
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AUTHOR
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Benoit Cloitre (benoit7848c(AT)orange.fr), Feb 05 2002
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EXTENSIONS
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a(13) to a(15) from Klaus Brockhaus (klaus-brockhaus(AT)t-online.de) Apr 13 2005
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