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Search: id:A065970
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| A065970 |
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n^2 * Sum_{primes p dividing n} (1 - 1/p^2). |
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+0
1
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| 0, 3, 8, 12, 24, 59, 48, 48, 72, 171, 120, 236, 168, 339, 416, 192, 288, 531, 360, 684, 824, 843, 528, 944, 600, 1179, 648, 1356, 840, 2339, 960, 768, 2048, 2019, 2376, 2124, 1368, 2523, 2864, 2736, 1680, 4619, 1848, 3372, 3744, 3699, 2208
(list; graph; listen)
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OFFSET
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1,2
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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) { for (n=1, 1000, s=0; p=2; while (p<=n, if(n%p == 0, s+=1 - 1/p^2); p=nextprime(p + 1)); write("b065970.txt", n, " ", n^2*s) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Nov 05 2009]
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CROSSREFS
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Sequence in context: A007434 A128303 A123906 this_sequence A024463 A092954 A114803
Adjacent sequences: A065967 A065968 A065969 this_sequence A065971 A065972 A065973
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KEYWORD
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nonn,new
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), Dec 09 2001
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