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Search: id:A093430
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| A093430 |
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Triangle read by rows: T(n,k)=LCM(n,n-1,...,n-k+2,n-k+1)/LCM(1,2,...,k) (1<=k<=n). |
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3
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| 1, 2, 1, 3, 3, 1, 4, 6, 2, 1, 5, 10, 10, 5, 1, 6, 15, 10, 5, 1, 1, 7, 21, 35, 35, 7, 7, 1, 8, 28, 28, 70, 14, 14, 2, 1, 9, 36, 84, 42, 42, 42, 6, 3, 1, 10, 45, 60, 210, 42, 42, 6, 3, 1, 1, 11, 55, 165, 330, 462, 462, 66, 33, 11, 11, 1, 12, 66, 110, 165, 66, 462, 66, 33, 11, 11, 1, 1, 13
(list; table; graph; listen)
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OFFSET
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1,2
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EXAMPLE
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T(7,3)=LCM(7,6,5)/LCM(1,2,3)=210/6=35.
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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)): for n from 1 to 13 do seq(T(n, k), k=1..n) od; # yields sequence in triangular form (Deutsch)
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CROSSREFS
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Cf. A093431, A093432, A093433.
Row sums yield A093431.
Sequence in context: A073020 A090349 A157379 this_sequence A074659 A131251 A057145
Adjacent sequences: A093427 A093428 A093429 this_sequence A093431 A093432 A093433
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KEYWORD
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nonn,tabl
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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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More terms from Emeric Deutsch (deutsch(AT)duke.poly.edu), Jan 30 2006
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