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Search: id:A074476
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| A074476 |
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Largest prime factor of 3^n + 1. |
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+0
4
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| 2, 2, 5, 7, 41, 61, 73, 547, 193, 37, 1181, 661, 6481, 398581, 16493, 271, 21523361, 1021, 530713, 101917, 42521761, 2269, 570461, 23535794707, 769, 22996651, 4795973261, 19927, 647753, 5385997, 47763361, 22434744889, 926510094425921
(list; graph; listen)
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OFFSET
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0,1
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LINKS
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S. S. Wagstaff, Jr., The Cunningham Project
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PROGRAM
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(PARI) for(n=0, 35, v=factor(3^n+1); print1(v[matsize(v)[1], 1], ", "))
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CROSSREFS
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Cf. A074477 (largest prime factor of 3^n - 1), A002587 (largest prime factor of 2^n + 1), A074478 (largest prime factor of 5^n + 1).
Sequence in context: A034438 A079280 A038750 this_sequence A011021 A077232 A087910
Adjacent sequences: A074473 A074474 A074475 this_sequence A074477 A074478 A074479
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KEYWORD
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easy,nonn
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AUTHOR
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Rick L. Shepherd (rshepherd2(AT)hotmail.com), Aug 23 2002
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