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Search: id:A065822
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| A065822 |
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5*EulerPhi[n] = 4*DivisorSigma[1,n];. |
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+0
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; listen)
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OFFSET
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1,1
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LINKS
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Harry J. Smith, Table of n, a(n) for n=1,...,60
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PROGRAM
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(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
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Cf. A000010, A000203, A065818, A065819, A062699
Sequence in context: A081264 A069107 A094412 this_sequence A158306 A083138 A121209
Adjacent sequences: A065819 A065820 A065821 this_sequence A065823 A065824 A065825
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KEYWORD
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easy,nonn
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AUTHOR
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Labos E. (labos(AT)ana.sote.hu), Nov 23 2001
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EXTENSIONS
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Terms a(9) - a(27) from Harry J. Smith (hjsmithh(AT)sbcglobal.net), Nov 01 2009
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