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Search: id:A062081
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| A062081 |
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Group the even numbers as (2,4), (6,8,10,12), (14,16,18,20,22,24), (26,28,30,32,34,36,38,40),... then a(n) = LCM of the n-th group. |
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1
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| 4, 120, 55440, 42325920, 7210803600, 43790142876480, 6338767304469600, 659267412349963697280, 1688424674909818263818400, 2043724034861836818744052800, 9347568224452825219277416992000
(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,...,100
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EXAMPLE
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a(2) = LCM (6,8,10,12) =120.
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PROGRAM
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(PARI) for(n=1, 20, p=1:forstep(k=2*(n^2-n+1), 2*(n^2+n), 2, p=lcm(p, k)):print1(p", "))
(PARI) { for (n=1, 100, a=b=2*n^2 - 2*n + 2; for (k=1, 2*n - 1, a=lcm(a, b + 2*k)); write("b062081.txt", n, " ", a) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Jul 31 2009]
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CROSSREFS
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Sequence in context: A001332 A071304 A006607 this_sequence A053881 A075114 A017186
Adjacent sequences: A062078 A062079 A062080 this_sequence A062082 A062083 A062084
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KEYWORD
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nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Jun 15 2001
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EXTENSIONS
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Corrected and extended by Ralf Stephan (ralf(AT)ark.in-berlin.de), Mar 20 2003
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