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A066961
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Sigma(n) divides sigma(sigma(n)).
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2
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1, 5, 12, 54, 56, 87, 95, 276, 308, 427, 429, 446, 455, 501, 581, 611, 9120, 9180, 9504, 9720, 9960, 10296, 10620, 10740, 10824, 11070, 11310, 11480, 11484, 11556, 11628, 11748, 11934, 11960, 12024, 12036, 12072, 12084, 12376, 12460, 12510, 12570
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| Is this sequence is finite?
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LINKS
| Harry J. Smith, Table of n, a(n) for n=1,...,1000
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PROG
| (PARI) { n=0; for (m=1, 10^10, if (sigma(sigma(m)) % sigma(m) == 0, write("b066961.txt", n++, " ", m); if (n==1000, return)) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Apr 11 2010]
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CROSSREFS
| Sequence in context: A188118 A062978 A189421 * A179994 A131549 A111904
Adjacent sequences: A066958 A066959 A066960 * A066962 A066963 A066964
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KEYWORD
| nonn
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AUTHOR
| Benoit Cloitre (benoit7848c(AT)orange.fr), Jan 26 2002
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EXTENSIONS
| More terms from Lior Manor (lior.manor(AT)gmail.com) Feb 06 2002
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