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A120435 Triangle read by rows: T(n,k) = lcm(1,2,3,4,...,n)/k (1 <= k <= n). 0
1, 2, 1, 6, 3, 2, 12, 6, 4, 3, 60, 30, 20, 15, 12, 60, 30, 20, 15, 12, 10, 420, 210, 140, 105, 84, 70, 60, 840, 420, 280, 210, 168, 140, 120, 105, 2520, 1260, 840, 630, 504, 420, 360, 315, 280, 2520, 1260, 840, 630, 504, 420, 360, 315, 280, 252, 27720, 13860, 9240 (list; table; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
T(n,1) = A003418(n). Row sums yield A025529. - Emeric Deutsch, Jul 24 2006
LINKS
EXAMPLE
Triangle starts:
1;
2, 1;
6, 3, 2;
12, 6, 4, 3;
60, 30, 20, 15, 12;
MAPLE
T:=proc(n, k) if k<=n then lcm(seq(j, j=1..n))/k else 0 fi end: for n from 1 to 11 do seq(T(n, k), k=1..n) od; # yields sequence in triangular form); # Emeric Deutsch, Jul 24 2006
CROSSREFS
Sequence in context: A107867 A158442 A252095 * A125901 A094307 A097905
KEYWORD
nonn,tabl
AUTHOR
Leroy Quet, Jul 15 2006
EXTENSIONS
More terms from Emeric Deutsch, Jul 24 2006
STATUS
approved

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Last modified March 29 11:14 EDT 2024. Contains 371278 sequences. (Running on oeis4.)