The On-Line Encyclopedia of Integer Sequences (OEIS)

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A160942

a(n)= n * digital sum(n-1)
(history; published version)

#5 by Charles R Greathouse IV at Thu Nov 21 12:49:37 EST 2013

MATHEMATICA

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

Discussion

Thu Nov 21

12:49

OEIS Server: https://oeis.org/edit/global/2062

#4 by Russ Cox at Sat Mar 31 14:00:42 EDT 2012

AUTHOR

_Claudio L Meller (claudiomeller(AT)gmail.com), _, May 30 2009

Discussion

Sat Mar 31

14:00

OEIS Server: https://oeis.org/edit/global/908

#3 by Harvey P. Dale at Mon Mar 14 16:56:11 EDT 2011

STATUS

proposed

approved

#2 by Harvey P. Dale at Mon Mar 14 16:56:06 EDT 2011

MATHEMATICA

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

STATUS

approved

proposed

#1 by N. J. A. Sloane at Tue Jun 01 03:00:00 EDT 2010

NAME

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

DATA

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

KEYWORD

nonn,base

AUTHOR

Claudio L Meller (claudiomeller(AT)gmail.com), May 30 2009

STATUS

approved