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A120435 Triangle read by rows: T(n,k) = lcm(1,2,3,4,...,n)/k (1 <= k <= n). 0

%I #9 Mar 04 2018 21:06:11

%S 1,2,1,6,3,2,12,6,4,3,60,30,20,15,12,60,30,20,15,12,10,420,210,140,

%T 105,84,70,60,840,420,280,210,168,140,120,105,2520,1260,840,630,504,

%U 420,360,315,280,2520,1260,840,630,504,420,360,315,280,252,27720,13860,9240

%N Triangle read by rows: T(n,k) = lcm(1,2,3,4,...,n)/k (1 <= k <= n).

%C T(n,1) = A003418(n). Row sums yield A025529. - _Emeric Deutsch_, Jul 24 2006

%e Triangle starts:

%e 1;

%e 2, 1;

%e 6, 3, 2;

%e 12, 6, 4, 3;

%e 60, 30, 20, 15, 12;

%p 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

%Y Cf. A003418, A094310.

%Y Cf. A003418, A025529.

%K nonn,tabl

%O 1,2

%A _Leroy Quet_, Jul 15 2006

%E More terms from _Emeric Deutsch_, Jul 24 2006

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Last modified April 16 18:51 EDT 2024. Contains 371750 sequences. (Running on oeis4.)