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Search: id:A093432
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| A093432 |
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a(n)=LCM_{k=1..n}(LCM(n,n-1,...,n-k+2,n-k+1)/LCM(1,2,...,k)). |
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+0
3
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| 1, 2, 3, 12, 10, 30, 105, 280, 252, 1260, 2310, 4620, 4290, 6006, 15015, 240240, 680680, 6126120, 11639628, 2771340, 1763580, 19399380, 223092870, 178474296, 171609900, 743642900, 1434168450, 20078358300, 19409079690, 19409079690
(list; graph; listen)
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OFFSET
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1,2
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EXAMPLE
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a(4)=LCM(LCM(4)/LCM(1), LCM(4,3)/LCM(1,2),LCM(4,3,2)/LCM(1,2,3),LCM(4,3,2,1)/LCM(1,2,3,4))=LCM(4,6,2,1)=12.
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MAPLE
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T:=(n, k)->lcm(seq(i, i=n-k+1..n))/lcm(seq(j, j=1..k)): seq(lcm(seq(T(n, k), k=1..n)), n=1..35); (Deutsch)
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CROSSREFS
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Cf. A093430, A093431, A093433.
LCM of the terms in row n of the triangle in A093430.
Sequence in context: A079077 A027611 A068550 this_sequence A100561 A081529 A002944
Adjacent sequences: A093429 A093430 A093431 this_sequence A093433 A093434 A093435
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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), Mar 31 2004
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EXTENSIONS
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Corrected and extended by Emeric Deutsch (deutsch(AT)duke.poly.edu), Jan 30 2006
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