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Search: id:A065969
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| A065969 |
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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, 5, 10, 20, 26, 85, 50, 80, 90, 229, 122, 340, 170, 445, 484, 320, 290, 765, 362, 916, 940, 1093, 530, 1360, 650, 1525, 810, 1780, 842, 3061, 962, 1280, 2308, 2605, 2524, 3060, 1370, 3253, 3220, 3664, 1682, 5965, 1850, 4372, 4356, 4765
(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("b065969.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: A086761 A045191 A065958 this_sequence A027884 A026357 A117518
Adjacent sequences: A065966 A065967 A065968 this_sequence A065970 A065971 A065972
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KEYWORD
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nonn
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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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