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Search: id:A067625
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| A067625 |
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Numbers n such that sigma(n)=phi(prime(n)+1). |
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+0
1
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| 23, 51, 77, 87, 114, 154, 158, 184, 210, 308, 552, 690, 786, 1330, 1848, 2030, 2280, 2868, 2976, 3432, 8680, 10290, 11556, 12750, 13110, 26400, 56808, 57960, 62496, 136290, 170478, 608580
(list; graph; listen)
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OFFSET
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1,1
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PROGRAM
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(PARI) a067625(m) = for(n=1, m, if(sigma(n)==eulerphi(prime(n)+1), print1(n, ", ")))
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CROSSREFS
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Sequence in context: A063321 A157095 A135771 this_sequence A140689 A113912 A055782
Adjacent sequences: A067622 A067623 A067624 this_sequence A067626 A067627 A067628
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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 23 2002
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EXTENSIONS
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More terms from Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), Mar 02 2002
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