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A047892
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a(1) = 2; for n > 0, a(n+1) = a(n) * sum of digits of a(n).
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15
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2, 4, 16, 112, 448, 7168, 157696, 5361664, 166211584, 5651193856, 276908498944, 19383594926080, 1298700860047360, 79220752462888960, 6733763959345561600, 592571228422409420800, 45035413360103115980800
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OFFSET
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1,1
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COMMENTS
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LINKS
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FORMULA
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MATHEMATICA
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NestList[# Total[IntegerDigits[#]]&, 2, 20] (* Harvey P. Dale, Jul 18 2011 *)
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PROG
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(Haskell)
a047892 n = a047892_list !! (n-1)
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CROSSREFS
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KEYWORD
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nonn,base,easy,nice
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AUTHOR
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Miklos SZABO (mike(AT)ludens.elte.hu)
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EXTENSIONS
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STATUS
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approved
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