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Search: id:A068978
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| A068978 |
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Numbers n such that sum(d|n,tau(d)/d) is an integer where tau(x)=A00005(x). |
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+0
1
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| 1, 2, 9, 18, 105, 210, 24375, 48750, 133848, 18780741, 18780965
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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Also n such that n divides A007429(n)
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PROGRAM
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(PARI) for(n=1, 20000000, if(denominator(sumdiv(n, d, numdiv(d)/d))==1, print1(n, ", ")))
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CROSSREFS
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Sequence in context: A083708 A037421 A083423 this_sequence A006226 A109298 A075537
Adjacent sequences: A068975 A068976 A068977 this_sequence A068979 A068980 A068981
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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), Apr 06 2002
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EXTENSIONS
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More terms from Rick L. Shepherd (rshepherd2(AT)hotmail.com), Jun 23 2002
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