A004162 Sum of digits of pentagonal numbers.

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

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