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Search: id:A095229
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| A095229 |
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a(1) = 1; a(n) = n multiplied by the concatenation of all previous terms. |
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+0
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| 1, 2, 36, 4944, 61824720, 7418966770948320, 86554612327730451932767396638240, 9891955694597765935173416758656692436898621843615462139173105920
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OFFSET
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1,2
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COMMENT
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a(n) >= 10^(2^(n-2)-1) (can be easily shown by induction)
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EXAMPLE
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Let n = 4. The previous terms are 1,2 and 36. Their concatentation is 1236. This number is multiplied by 4 and we get a(4) = 4944.
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MATHEMATICA
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a = {1}; For[n=2, n<10, n++, AppendTo[a, n*FromDigits[Flatten[IntegerDigits[a]]]]]; a
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CROSSREFS
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Sequence in context: A088026 A126934 A001070 this_sequence A047832 A004003 A060739
Adjacent sequences: A095226 A095227 A095228 this_sequence A095230 A095231 A095232
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KEYWORD
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base,nonn,less
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Jun 11 2004
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EXTENSIONS
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Edited, corrected and extended by Stefan Steinerberger (stefan.steinerberger(AT)gmail.com), Jun 16 2007
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