A077253 - OEIS

A077253

Sum of digits squared plus sum of digits of n.

2, 6, 12, 20, 30, 42, 56, 72, 90, 2, 4, 8, 14, 22, 32, 44, 58, 74, 92, 6, 8, 12, 18, 26, 36, 48, 62, 78, 96, 12, 14, 18, 24, 32, 42, 54, 68, 84, 102, 20, 22, 26, 32, 40, 50, 62, 76, 92, 110, 30, 32, 36, 42, 50, 60, 72, 86, 102, 120, 42, 44, 48, 54, 62, 72, 84, 98, 114, 132

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

Inspired by A071440. The quasi-periodic function. See also A077252.

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..1000

EXAMPLE

a(13)=14 because (1^2+3^2)+(1+3)=14.

MATHEMATICA

sd[n_]:=Module[{idn=IntegerDigits[n]}, Total[idn+idn^2]]; Array[sd, 80] (* Harvey P. Dale, Aug 12 2012 *)

PROG