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Search: id:A067680
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| A067680 |
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Numbers n such that sigma(2n+2)=4n. |
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+0
1
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| 6, 21, 54, 75, 441, 1071, 4191, 9315, 58311, 4197375, 7685151, 36997695, 268460031, 1073790975, 17180065791
(list; graph; listen)
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OFFSET
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1,1
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CROSSREFS
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Sequence in context: A135454 A069778 A015644 this_sequence A115052 A025203 A002817
Adjacent sequences: A067677 A067678 A067679 this_sequence A067681 A067682 A067683
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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 04 2002
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EXTENSIONS
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58311 sent by Benoit Cloitre and Neven Juric (neven.juric(AT)apis-it.hr), May 21 2004
a(10)-a(15) from Donovan Johnson (donovan.johnson(AT)yahoo.com), Jan 31 2009
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