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Search: id:A047897
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| A047897 |
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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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| 5, 25, 175, 2275, 36400, 473200, 7571200, 166566400, 5663257600, 226530304000, 5663257600000, 226530304000000, 5663257600000000, 226530304000000000, 5663257600000000000, 226530304000000000000, 5663257600000000000000
(list; graph; listen)
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OFFSET
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5,1
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COMMENT
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After the 9th element, every second element has the same beginning. a(11+2k) = 40 * a(10+2k) = 40 * 25 * a(9+2k)
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MAPLE
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P:=proc(n) local a, i, k, w; a:=5; 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: A035341 A137383 A049035 this_sequence A121144 A096684 A096245
Adjacent sequences: A047894 A047895 A047896 this_sequence A047898 A047899 A047900
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KEYWORD
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easy,nonn,base
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AUTHOR
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Miklos SZABO (mike(AT)ludens.elte.hu)
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