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Search: id:A063744
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| A063744 |
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a(n) = sigma(a(n-1) * number of divisors of a(n-1), a(1)=2. |
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+0
1
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| 2, 6, 48, 1240, 46080, 10537956, 4755179520, 21601740363840, 320026934857728000, 5141450783421628416000, 254900463912224253775282176, 22582740409889438693597632266240
(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,...,40
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PROGRAM
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(PARI) s(n) = if(n<2, n=2, sigma(s(n-1))*numdiv(s(n-1))); for(n=1, 20, print(s(n)))
(PARI) { for (n=1, 40, if (n>1, a=sigma(a)*numdiv(a), a=2); write("b063744.txt", n, " ", a) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Aug 29 2009]
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CROSSREFS
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Sequence in context: A129464 A003053 A113296 this_sequence A141609 A096313 A126023
Adjacent sequences: A063741 A063742 A063743 this_sequence A063745 A063746 A063747
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KEYWORD
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easy,nonn
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AUTHOR
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Jason Earls (zevi_35711(AT)yahoo.com), Aug 14 2001
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