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Least number k such that the k-th Catalan number C(2k,k)/(k+1) is divisible by n!.
5

%I #8 Oct 02 2013 15:12:52

%S 1,2,5,14,14,46,46,382,446,1662,1662,3582,3582,4094,4094,130942,

%T 130942,458238,458238,1040382,1046526,2883582,3129342,16760830,

%U 16760830,56623102,66584318,367001598,367001598,670826494,670826494,8589672446,12348030974

%N Least number k such that the k-th Catalan number C(2k,k)/(k+1) is divisible by n!.

%H Max Alekseyev, <a href="/A120626/b120626.txt">Table of n, a(n) for n = 1..189</a>

%t f[0] = 1, f[n_] := Block[{k = f[n - 1]}, While[ !IntegerQ[ Binomial[2k, k]/(n!(k + 1))], k++ ]; k]; Array[f, 20]

%Y Cf. A000108.

%K nonn

%O 1,2

%A _Robert G. Wilson v_, Jun 19 2006

%E More terms from _Ryan Propper_, Oct 13 2006

%E Further terms from _Ryan Propper_, Dec 25 2007

%E Further terms from Max Alekseyev, Feb 04 2008

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Last modified September 24 00:34 EDT 2024. Contains 376185 sequences. (Running on oeis4.)