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Search: id:A068391
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| A068391 |
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Numbers n such that sigma(n)=3*phi(n). |
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+0
2
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| 2, 15, 357, 3339, 5049, 10659, 12441, 24969, 99693, 124355, 132957, 145145, 353133, 423657, 596037, 655707, 734517, 745503, 894387, 1406427, 1641783, 1823877, 1936557, 3295047, 4108401, 4194183, 4776201, 5574699, 5842137
(list; graph; listen)
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OFFSET
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1,1
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PROGRAM
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PARI : for(n=1, 500000, if(sigma(n)==3*eulerphi(n), print1(n, ", ")))
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CROSSREFS
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Sequence in context: A003025 A015200 A030642 this_sequence A132874 A071102 A060381
Adjacent sequences: A068388 A068389 A068390 this_sequence A068392 A068393 A068394
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KEYWORD
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easy,nonn
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AUTHOR
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Benoit Cloitre (benoit7848c(AT)orange.fr), Mar 03 2002
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EXTENSIONS
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More terms from Rick L. Shepherd (rshepherd2(AT)hotmail.com), May 14 2002
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