A160942 a(n)= n * digital sum(n-1)

0, 2, 6, 12, 20, 30, 42, 56, 72, 90, 11, 24, 39, 56, 75, 96, 119, 144, 171, 200, 42, 66, 92, 120, 150, 182, 216, 252, 290, 330, 93, 128, 165, 204, 245, 288, 333, 380, 429, 480, 164, 210, 258, 308, 360, 414, 470, 528, 588, 650, 255, 312, 371, 432, 495, 560, 627, 696

Offset

1,2

Comments

a(8)=8xds(7)=8x7=56; a(15)=15xds(14)=15X5=75; a(26)=26xds(25)=26x7=182

Links

Table of n, a(n) for n=1..58.

Mathematica

Table[n Total[IntegerDigits[n-1]], {n, 75}]  (* Harvey P. Dale, Mar 14 2011 *)

Crossrefs

Sequence in context: A077253 A098734 A258881 * A160929 A103505 A279019

Adjacent sequences: A160939 A160940 A160941 * A160943 A160944 A160945

Keyword

nonn,base

Author

Claudio Meller, May 30 2009

Status

approved