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Search: id:A138963
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| A138963 |
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a(1)=1; a(n+1) = the biggest prime divisor of A138793(n+1). |
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+0
1
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| 1, 7, 107, 149, 953, 218107, 402859, 4877, 379721, 4349353, 169373, 182473, 1940144339383, 2184641, 437064932281, 5136696159619, 67580875919190833, 1156764458711, 464994193118899, 4617931439293
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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For the smallest prime divisors of A138793 see A138962
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MATHEMATICA
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b = {}; a = {}; Do[w = RealDigits[n]; w = First[w]; Do[AppendTo[a, w[[k]]], {k, 1, Length[w]}]; p = FromDigits[Reverse[a]]; AppendTo[b, First[Last[FactorInteger[p]]]], {n, 1, 31}]; b (*Artur Jasinski*)
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CROSSREFS
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Cf. A104759, A000422, A116504, A007908, A116505, A104759, A075019, A075020, A075021, A075022, A138789, A138790, A138958, A138959, A138960, A138962.
Sequence in context: A141358 A141362 A075021 this_sequence A141932 A002687 A033516
Adjacent sequences: A138960 A138961 A138962 this_sequence A138964 A138965 A138966
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KEYWORD
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nonn
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AUTHOR
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Artur Jasinski (grafix(AT)csl.pl), Apr 04 2008
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