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Search: id:A103740
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| A103740 |
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Numbers n such that n! * F(n) + 1 is prime. |
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+0
1
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| 1, 2, 3, 4, 5, 7, 8, 10, 11, 15, 41, 98, 149, 193, 233, 265, 403, 898, 935, 1291, 2079
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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All values through 2079 have been proved prime with WinPFGW. No more terms up to 6700. Primality testing 2079!*F(2079)+1 [N-1, Brillhart-Lehmer-Selfridge] Running N-1 test using base 2087 Running N-1 test using base 2099 Calling Brillhart-Lehmer-Selfridge with factored part 33.88% 2079!*F(2079)+1 is prime! (15.2535s+0.0043s)
No more terms < 6729. - David Wasserman (dwasserm(AT)earthlink.net), Apr 24 2008
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EXAMPLE
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a(6)=7 because 7!*fibonacci(7)+1 = 65521, a prime.
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CROSSREFS
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Cf. A005443.
Sequence in context: A025199 A107912 A066077 this_sequence A034155 A129590 A062469
Adjacent sequences: A103737 A103738 A103739 this_sequence A103741 A103742 A103743
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KEYWORD
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nonn,less
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AUTHOR
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Jason Earls (zevi_35711(AT)yahoo.com), Mar 28 2005
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