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A004162 Sum of digits of pentagonal numbers. 0
1, 5, 3, 4, 8, 6, 7, 11, 9, 10, 14, 3, 13, 17, 6, 16, 11, 18, 10, 14, 12, 13, 17, 15, 16, 2, 9, 10, 14, 12, 13, 8, 15, 16, 11, 18, 10, 14, 12, 13, 8, 15, 16, 20, 9, 10, 14, 12, 22, 17, 24, 7, 20, 18, 10, 23, 21, 13, 17, 15, 16, 20, 18, 10, 14, 12, 13, 17, 15, 16, 20, 18, 28, 23, 12, 22, 26 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..77.

MATHEMATICA

Table[Total[IntegerDigits[(n(3n-1))/2]], {n, 80}] (* Harvey P. Dale, Jan 20 2015 *)

CROSSREFS

Cf. A000326.

Sequence in context: A111889 A004494 A193090 * A319053 A109681 A196406

Adjacent sequences:  A004159 A004160 A004161 * A004163 A004164 A004165

KEYWORD

nonn,base

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified February 23 12:03 EST 2019. Contains 320431 sequences. (Running on oeis4.)