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A070280 a(1) = 1; a(n) = a(n-1) + product of the digits of n-1. 0
1, 2, 4, 7, 11, 16, 22, 29, 37, 46, 46, 47, 49, 52, 56, 61, 67, 74, 82, 91, 91, 93, 97, 103, 111, 121, 133, 147, 163, 181, 181, 184, 190, 199, 211, 226, 244, 265, 289, 316, 320, 328, 340, 356, 376, 400, 428, 460, 496, 496, 501, 511, 526, 546, 571, 601, 636, 676 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

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

EXAMPLE

a(12) = a(11) + product of digits of 11 = 46 + 1 = 47.

MATHEMATICA

a[n_] := a[n] = (a[n - 1] + Times @@ IntegerDigits[n - 1]); a[1] = 1; Table[ a[n], {n, 1, 60}]

CROSSREFS

Sequence in context: A025702 A025717 A025726 * A025707 A025733 A025716

Adjacent sequences:  A070277 A070278 A070279 * A070281 A070282 A070283

KEYWORD

base,nonn

AUTHOR

Joseph L. Pe, May 09 2002

EXTENSIONS

Edited by Robert G. Wilson v, May 14 2002

STATUS

approved

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Last modified December 14 01:33 EST 2019. Contains 329978 sequences. (Running on oeis4.)