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Search: id:A063475
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| A063475 |
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Sum_{d | H(n)} d^2, where H(n) is the Half-Totient function (A023022). |
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+0
1
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| 1, 1, 5, 1, 10, 5, 10, 5, 26, 5, 50, 10, 21, 21, 85, 10, 91, 21, 50, 26, 122, 21, 130, 50, 91, 50, 250, 21, 260, 85, 130, 85, 210, 50, 455, 91, 210, 85, 546, 50, 500, 130, 210, 122, 530, 85, 500, 130, 341, 210, 850, 91, 546, 210, 455, 250, 842, 85, 1300, 260, 455, 341
(list; graph; listen)
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OFFSET
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3,3
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LINKS
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Harry J. Smith, Table of n, a(n) for n=3,...,1000
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PROGRAM
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(PARI) H(n)=eulerphi(n)/2; j=[]; for(n=3, 150, j=concat(j, sumdiv(H(n), d, d^2))); j
(PARI) { for (n=3, 1000, write("b063475.txt", n, " ", sumdiv(eulerphi(n)/2, d, d^2)) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Aug 22 2009]
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CROSSREFS
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Cf. A023022.
Sequence in context: A145759 A131414 A050308 this_sequence A135855 A116547 A013612
Adjacent sequences: A063472 A063473 A063474 this_sequence A063476 A063477 A063478
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KEYWORD
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nonn
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AUTHOR
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Jason Earls (zevi_35711(AT)yahoo.com), Jul 27 2001
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