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A066930
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phi(sigma(n)) divides sigma(phi(n)).
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2
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1, 7, 9, 29, 71, 97, 109, 121, 139, 142, 175, 183, 194, 215, 225, 242, 244, 261, 278, 311, 344, 349, 355, 430, 497, 509, 516, 533, 556, 571, 605, 622, 631, 647, 673, 709, 729, 791, 817, 859, 911, 923, 1021, 1066, 1112, 1119, 1142, 1207, 1243, 1262, 1277
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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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(eulerphi(m)) % eulerphi(sigma(m)) == 0, write("b066930.txt", n++, " ", m); if (n==1000, return)) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Apr 08 2010]
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CROSSREFS
| Cf. A033632.
Sequence in context: A032617 A113124 A030404 * A154260 A186234 A085903
Adjacent sequences: A066927 A066928 A066929 * A066931 A066932 A066933
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KEYWORD
| nonn
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AUTHOR
| Benoit Cloitre (benoit7848c(AT)orange.fr), Jan 26 2002
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