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Search: id:A063476
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| A063476 |
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Sum_{d |C(n)} d^2, where C(n) is the Cototient function n - phi(n) (A051953). |
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+0
1
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| 0, 1, 1, 5, 1, 21, 1, 21, 10, 50, 1, 85, 1, 85, 50, 85, 1, 210, 1, 210, 91, 210, 1, 341, 26, 250, 91, 341, 1, 610, 1, 341, 170, 455, 122, 850, 1, 546, 260, 850, 1, 1300, 1, 850, 500, 850, 1, 1365, 50, 1300, 362, 1050, 1, 1911, 260, 1365, 500, 1300, 1, 2562, 1, 1365
(list; graph; listen)
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OFFSET
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1,4
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LINKS
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Harry J. Smith, Table of n, a(n) for n=1,...,1000
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PROGRAM
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(PARI) C(n)=n-eulerphi(n); j=[]; for(n=1, 200, j=concat(j, sumdiv(C(n), d, d^2))); j
(PARI) { for (n=1, 1000, if (n>1, a=sumdiv(n-eulerphi(n), d, d^2), a=0); write("b063476.txt", n, " ", a) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Aug 22 2009]
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CROSSREFS
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Cf. A051953.
Sequence in context: A049411 A070729 A101693 this_sequence A126325 A095368 A029757
Adjacent sequences: A063473 A063474 A063475 this_sequence A063477 A063478 A063479
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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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