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Search: id:A164649
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| A164649 |
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Numbers n such that sigma(n)/phi(n) = 36/25. |
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+0
2
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| 5797, 10153, 20377, 50953, 383719, 405449, 446039, 486421, 608399, 973709, 1321529, 1521311
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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A subsequence of A011257. See A164646-A164650 for related sequences.
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PROGRAM
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(PARI) for( n=1, 1e7, sigma(n)==36/25*eulerphi(n) && print1(n", "))
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CROSSREFS
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Cf. A000010 (=phi), A000203 (=sigma), A068390 (sigma/phi=4), A163667 (sigma/phi=9), A164646-A164650.
Sequence in context: A004973 A114361 A098476 this_sequence A104284 A131494 A147859
Adjacent sequences: A164646 A164647 A164648 this_sequence A164650 A164651 A164652
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KEYWORD
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more,nonn
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AUTHOR
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M. F. Hasler (mhasler(AT)univ-ag.fr), Aug 22 2009
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