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A068986
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Numbers n such that sum(d|n, sigma(d)/d) is an integer.
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0
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1, 21, 105, 1050, 1155, 24921, 26565, 45150, 49842, 59455, 249210, 274131, 548262, 1129645, 1151325, 1248555, 1309350, 2302650, 2741310, 3388935, 4605300
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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PROG
| (PARI) for(n=1, 10^7, if(frac(sumdiv(n, d, sigma(d)/d))==0, print1(n, ", ")))
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CROSSREFS
| Sequence in context: A126229 A060537 A116689 * A077400 A041854 A071333
Adjacent sequences: A068983 A068984 A068985 * A068987 A068988 A068989
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KEYWORD
| easy,nonn
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AUTHOR
| Benoit Cloitre (benoit7848c(AT)orange.fr), Apr 06 2002
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EXTENSIONS
| More terms from Jason Earls (zevi_35711(AT)yahoo.com), Apr 09 2002
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