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A004160 Sum of digits of tetrahedral numbers. 2
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, 10, 22, 19, 20, 26, 20, 12, 21, 21, 22, 25, 13, 14, 11, 14, 15, 15, 15, 25, 19, 16, 17, 5, 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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Harvey P. Dale, Table of n, a(n) for n = 1..1000

FORMULA

a(n) = A007953(A000292(n)). - Michel Marcus, Dec 19 2016

MATHEMATICA

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

PROG

(PARI) a(n)=sumdigits(n*(n+1)*(n+2)/6) \\ Charles R Greathouse IV, Dec 19 2016

CROSSREFS

Cf. A000292, A007953.

Sequence in context: A081454 A133883 A279816 * A128077 A128078 A264922

Adjacent sequences:  A004157 A004158 A004159 * A004161 A004162 A004163

KEYWORD

nonn,base,easy

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified October 22 18:17 EDT 2019. Contains 328319 sequences. (Running on oeis4.)