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Search: id:A113892
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| A113892 |
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a(1) = 3; thereafter, a(n+1) is the largest prime divisor of the concatenation of all previous terms. |
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| 3, 3, 11, 43, 151, 2837, 55582381, 55582381, 604182026353013, 7260821549599941816463, 10950115817553553947281369915579, 10950115817553553947281369915579
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OFFSET
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1,1
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EXAMPLE
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The largest prime divisor of 3311 is 43. 3311 = 7*11*43. Hence a(4) = 43.
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MATHEMATICA
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a[1] = 3; a[n_] := a[n] = FactorInteger[ FromDigits@ Flatten[ IntegerDigits /@ Array[a, n - 1]]][[ -1, 1]]; Array[a, 12] - Robert G. Wilson v (rgwv(AT)rgwv.com), Aug 31 2008
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CROSSREFS
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Cf. A095215.
Adjacent sequences: A113889 A113890 A113891 this_sequence A113893 A113894 A113895
Sequence in context: A124265 A109937 A054101 this_sequence A078225 A066437 A065957
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KEYWORD
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base,nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Nov 18 2005
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EXTENSIONS
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More terms from Stefan Steinerberger (hansibal(AT)hotmail.com), Nov 19 2005
2 more terms from Robert G. Wilson v (rgwv(AT)rgwv.com), Aug 31 2008
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