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Search: id:A047903
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| A047903 |
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a(n+1) = a(n) * sum of digits of a(n). |
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+0
3
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| 13, 52, 364, 4732, 75712, 1665664, 56632576, 2265303040, 56632576000, 2265303040000, 56632576000000, 2265303040000000, 56632576000000000, 2265303040000000000, 56632576000000000000, 2265303040000000000000
(list; graph; listen)
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OFFSET
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13,1
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COMMENT
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After the 7th element, every second element has the same beginning. a(9+2k) = 40 * a(8+2k) = 40 * 25 * a(7+2k)
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MAPLE
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P:=proc(n) local a, i, k, w; a:=13; print(a); for i from 1 by 1 to n do w:=0; k:=a; while k>0 do w:=w+k-(trunc(k/10)*10); k:=trunc(k/10); od; a:=a*w; print(a); od; end: P(1000); - Paolo P. Lava (ppl(AT)spl.at), Apr 27 2007
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CROSSREFS
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Cf. A047892.
Sequence in context: A108919 A002792 A022673 this_sequence A076163 A056255 A141885
Adjacent sequences: A047900 A047901 A047902 this_sequence A047904 A047905 A047906
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KEYWORD
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easy,nonn
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AUTHOR
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Miklos SZABO (mike(AT)ludens.elte.hu)
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