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Search: id:A083557
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| A083557 |
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a(n) is the greatest prime factor of 3*a(n-1)+2. |
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+0
2
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| 3, 11, 7, 23, 71, 43, 131, 79, 239, 719, 127, 383, 1151, 691, 83, 251, 151, 13, 41, 5, 17, 53, 23, 71, 43, 131, 79, 239, 719, 127, 383, 1151, 691, 83, 251, 151, 13, 41, 5, 17, 53, 23, 71, 43, 131, 79, 239, 719, 127, 383, 1151, 691, 83, 251, 151, 13, 41, 5, 17, 53, 23
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Conjecture: if a(1)=m then the sequence becomes cyclic, for any m.
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MATHEMATICA
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f[n_] := Flatten[Table[ #[[1]], {1}] & /@ FactorInteger[ 3n + 2 ]][[ -1]]; NestWhileList[f, 3, UnsameQ, All]
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CROSSREFS
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Cf. A031439, A031440, A031442, A082021, A082132, A084923.
Sequence in context: A094900 A164808 A153285 this_sequence A119324 A006495 A112286
Adjacent sequences: A083554 A083555 A083556 this_sequence A083558 A083559 A083560
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KEYWORD
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nonn
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AUTHOR
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Yasutoshi Kohmoto (zbi74583(AT)boat.zero.ad.jp), Jun 05 2003
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EXTENSIONS
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Conjecture verified by Jud McCranie up to 25000000. Jun 11, 2003
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