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Search: id:A120105
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| A120105 |
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Number triangle lcm(1,..,2n+2)/lcm(1,..,2k+2). |
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+0
1
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| 1, 6, 1, 30, 5, 1, 420, 70, 14, 1, 1260, 210, 42, 3, 1, 13860, 2310, 462, 33, 11, 1, 180180, 30030, 6006, 429, 143, 13, 1, 360360, 60060, 12012, 858, 286, 26, 2, 1, 6126120, 1021020, 204204, 14586, 4862, 442, 34, 17, 1, 116396280, 19399380, 3879876
(list; table; graph; listen)
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OFFSET
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0,2
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COMMENT
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First column is A119634. Second column is A051538. Inverse is A120111.
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FORMULA
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Number triangle T(n,k)=[k<=n]+lcm(1,..,2n+2)/lcm(1,..,2k+2)
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EXAMPLE
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Triangle begins
1,
6, 1,
30, 5, 1,
420, 70, 14, 1,
1260, 210, 42, 3, 1,
13860, 2310, 462, 33, 11, 1,
180180, 30030, 6006, 429, 143, 13, 1
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CROSSREFS
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Sequence in context: A145629 A118933 A046212 this_sequence A120101 A030524 A051930
Adjacent sequences: A120102 A120103 A120104 this_sequence A120106 A120107 A120108
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KEYWORD
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easy,nonn,tabl
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AUTHOR
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Paul Barry (pbarry(AT)wit.ie), Jun 09 2006
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