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A162845 Sum of digits of binomial(3n,n). 0

%I #6 Mar 04 2019 00:20:23

%S 1,3,6,12,18,6,24,18,27,39,18,36,36,36,42,60,63,63,78,72,72,63,72,90,

%T 72,99,90,75,117,108,90,99,117,117,99,162,126,144,153,153,153,159,150,

%U 126,153,114,144,171,171,171,162,162,198,180,186,207,180,189,180,234,207

%N Sum of digits of binomial(3n,n).

%e a(4)=sum of digits of binomial(3*4,4)=18 because binomial(3*4,4)=495.

%p a := proc (n) local nn: nn := convert(binomial(3*n, n), base, 10): add(nn[j], j = 1 .. nops(nn)) end proc: seq(a(n), n = 0 .. 70); # _Emeric Deutsch_, Jul 29 2009

%K nonn,base

%O 0,2

%A _Yalcin Aktar_, Jul 14 2009

%E Extended by _Emeric Deutsch_, Jul 29 2009

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Last modified March 28 07:48 EDT 2024. Contains 371235 sequences. (Running on oeis4.)