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Search: id:A062079
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| A062079 |
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Group the odd numbers as 1, (3,5), (7,9,11), (13,15,17,19), (21,23,25,27,29),... then a(n) = LCM of the n-th group. |
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+0
1
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| 1, 15, 693, 62985, 3151575, 706110405, 44166438855, 30637289555145, 3274769391079725, 312250034062131165, 593968671422526274875, 5531265959247033940935, 95840860214492177176316925
(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,...,100
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EXAMPLE
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a(3) = LCM (7,9,11) =693.
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PROGRAM
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(PARI) a(n) = local(r); r=1; forstep(k=n^2-n+1, n^2+n-1, 2, r=lcm(r, k)); r [From Franklin T. Adams-Watters (FrankTAW(AT)Netscape.net), Jul 03 2009]
(PARI) { for (n=1, 100, a=b=n^2 - n + 1; for (k=1, n - 1, a=lcm(a, b + 2*k)); write("b062079.txt", n, " ", a) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Jul 31 2009]
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CROSSREFS
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Cf. A057003, A062032. [From Franklin T. Adams-Watters (FrankTAW(AT)Netscape.net), Jul 03 2009]
Sequence in context: A079600 A166186 A001520 this_sequence A062032 A117812 A034941
Adjacent sequences: A062076 A062077 A062078 this_sequence A062080 A062081 A062082
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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 Franklin T. Adams-Watters (FrankTAW(AT)Netscape.net), Jul 03 2009
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