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A065822
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5*phi(n) = 4*sigma(n).
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3
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323, 377, 22591, 42619, 49751, 106711, 119647, 180947, 2782057, 2980823, 2981233, 3794737, 5112427, 5285743, 5732179, 5964229, 6073267, 6669797, 6769927, 7049407, 8025547, 8350633, 8954023, 9373213, 10039471, 10140517, 10842901
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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LINKS
| Harry J. Smith, Table of n, a(n) for n = 1..60
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PROG
| (PARI) { n=0; for (m=1, 10^9, if (5*eulerphi(m) == 4*sigma(m), write("b065822.txt", n++, " ", m); if (n==60, return)) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Nov 01 2009]
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CROSSREFS
| Cf. A000010, A000203, A065818, A065819, A062699
Sequence in context: A069107 A094412 A177745 * A158306 A083138 A121209
Adjacent sequences: A065819 A065820 A065821 * A065823 A065824 A065825
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KEYWORD
| nonn
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AUTHOR
| Labos E. (labos(AT)ana.sote.hu), Nov 23 2001
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EXTENSIONS
| Terms a(9)-a(27) from Harry J. Smith (hjsmithh(AT)sbcglobal.net), Nov 01 2009
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