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A095992 a(1) = 30; for n > 1, a(n+1) = a(n) + {product of nonzero digits of a(n)}. 0
30, 33, 42, 50, 55, 80, 88, 152, 162, 174, 202, 206, 218, 234, 258, 338, 410, 414, 430, 442, 474, 586, 826, 922, 958, 1318, 1342, 1366, 1474, 1586, 1826, 1922, 1958, 2318, 2366, 2582, 2742, 2854, 3174, 3258, 3498, 4362, 4506, 4626, 4914, 5058, 5258, 5658 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
REFERENCES
From a puzzle; explanation found by Pierre Roger.
LINKS
Frank Rubin, Number Series
MATHEMATICA
a[1] = 30; a[n_] := a[n] = Block[{s = Sort[ IntegerDigits[a[n - 1]]]}, While[ s[[1]] == 0, s = Drop[s, 1]]; a[n - 1] + Times @@ s]; Table[ a[n], {n, 50}]
nxt[n_] := n+Times@@Select[IntegerDigits[n], #>0&]; NestList[nxt, 30, 50] (* Harvey P. Dale, Jan 08 2011 *)
CROSSREFS
Sequence in context: A095471 A095465 A295693 * A061842 A109226 A218114
KEYWORD
nonn,base,easy
AUTHOR
Julien Piquet (julipiquet(AT)yahoo.fr), Jul 18 2004
EXTENSIONS
The proposer suggests that this web site may contain other sequences also.
Edited and extended by Robert G. Wilson v and Klaus Brockhaus, Jul 20 2004
STATUS
approved

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Last modified April 19 10:38 EDT 2024. Contains 371791 sequences. (Running on oeis4.)