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A004160 Sum of digits of tetrahedral numbers. 2

%I

%S 1,4,1,2,8,11,12,3,12,4,16,13,14,11,14,15,24,6,7,10,16,8,5,8,18,18,18,

%T 10,22,19,20,26,20,12,21,21,22,25,13,14,11,14,15,15,15,25,19,16,17,5,

%U 17,18,18,18,19,22,19,11,26,20,21,21,21,22,25,13,23,20,23,24,24,24,25,10,16,26

%N Sum of digits of tetrahedral numbers.

%H Harvey P. Dale, <a href="/A004160/b004160.txt">Table of n, a(n) for n = 1..1000</a>

%F a(n) = A007953(A000292(n)). - _Michel Marcus_, Dec 19 2016

%t Total[IntegerDigits[#]]&/@Table[(n(n+1)(n+2))/6,{n,80}] (* _Harvey P. Dale_, Jul 31 2013 *)

%o (PARI) a(n)=sumdigits(n*(n+1)*(n+2)/6) \\ _Charles R Greathouse IV_, Dec 19 2016

%Y Cf. A000292, A007953.

%K nonn,base,easy

%O 1,2

%A _N. J. A. Sloane_.

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Last modified March 20 23:22 EDT 2019. Contains 321354 sequences. (Running on oeis4.)