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Search: id:A120108
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| A120108 |
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Number triangle lcm(1,..,n+1)/lcm(1,..,k+1). |
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+0
4
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| 1, 2, 1, 6, 3, 1, 12, 6, 2, 1, 60, 30, 10, 5, 1, 60, 30, 10, 5, 1, 1, 420, 210, 70, 35, 7, 7, 1, 840, 420, 140, 70, 14, 14, 2, 1, 2520, 1260, 420, 210, 42, 42, 6, 3, 1, 2520, 1260, 420, 210, 42, 42, 6, 3, 1, 1, 27720, 13860, 4620, 2310, 462, 462, 66, 33, 11, 11, 1
(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 A003418(n+1). Second column is A025555. Row sums are A120109. Diagonal sums are A120110. Inverse is A120111.
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FORMULA
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Number triangle T(n,k)=[k<=n]*lcm(1,..,n+1)/lcm(1,..,k+1)
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EXAMPLE
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Triangle begins
1,
2, 1,
6, 3, 1,
12, 6, 2, 1,
60, 30, 10, 5, 1,
60, 30, 10, 5, 1, 1,
420, 210, 70, 35, 7, 7, 1
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CROSSREFS
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Sequence in context: A065553 A016545 A142977 this_sequence A060556 A132813 A034898
Adjacent sequences: A120105 A120106 A120107 this_sequence A120109 A120110 A120111
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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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