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Search: id:A109800
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| A109800 |
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Numbers n such that 55*10^n + 1 is prime. |
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+0
1
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| 2, 3, 7, 9, 33, 61, 93, 112, 284, 615, 1293, 2558, 2925, 5961, 6454, 7960, 17521
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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All values proved prime. No more up to 25000. Primality proof for the largest: PFGW Version 20041001.Win_Stable (v1.2 RC1b) [FFT v23.8] Primality testing 55*10^17521+1 [N-1, Brillhart-Lehmer-Selfridge] Running N-1 test using base 3 Calling Brillhart-Lehmer-Selfridge with factored part 69.89% 55*10^17521+1 is prime! (48.1892s+0.1481s)
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CROSSREFS
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Cf. A056806, A056805.
Sequence in context: A057239 A024541 A107861 this_sequence A059180 A051637 A051471
Adjacent sequences: A109797 A109798 A109799 this_sequence A109801 A109802 A109803
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KEYWORD
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more,nonn
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AUTHOR
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Jason Earls (zevi_35711(AT)yahoo.com), Aug 15 2005
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