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A113904 Starting with 1, each number is the previous number plus the product of the index number and the sum of the digits of the previous number. 0
1, 2, 6, 24, 48, 108, 162, 225, 297, 459, 639, 837, 1053, 1170, 1296, 1566, 1854, 2160, 2322, 2493, 2853, 3231, 3429, 3843, 4275, 4725, 5193, 5679, 6435, 6957, 7767, 8604, 9180, 9774, 10692, 11322, 11646, 12312, 12654, 13356, 14076, 14814, 15570, 16344 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..44.

FORMULA

a(n) = a(n-1)+(n-1)*s(n-1), where s(n) stands for the sum of the digits of n.

EXAMPLE

a(6) = a(5)+ 5*s(a(5)) = 48+5*s(48) = 48+5*12 = 108

MATHEMATICA

nxt[{n_, a_}]:={n+1, a+(n+1)Total[IntegerDigits[a]]}; Transpose[NestList[ nxt, {0, 1}, 50]][[2]] (* Harvey P. Dale, Jun 25 2013 *)

CROSSREFS

Sequence in context: A000496 A004306 A092485 * A099144 A354216 A189851

Adjacent sequences:  A113901 A113902 A113903 * A113905 A113906 A113907

KEYWORD

base,easy,nonn

AUTHOR

Luc Stevens (lms022(AT)yahoo.com), Apr 20 2006

EXTENSIONS

Corrected by Harvey P. Dale, Jun 25 2013

STATUS

approved

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Last modified October 2 23:51 EDT 2022. Contains 357230 sequences. (Running on oeis4.)