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Search: id:A108375
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| A108375 |
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Least positive k such that k * [RSA-200]^n - 1 is prime, where RSA-200 is defined in the Wikinews link. |
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+0
3
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| 356, 810, 1364, 1188, 1490, 4178, 164, 11312, 26, 4058, 11234
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Another term is a(51)=854. All values have been proved prime. Primality proof for a(51), which has 10175 digits: PFGW Version 1.2.0 for Windows [FFT v23.8] Primality testing 854*(279978 ... [digits deleted] ... 823983)^51-1 [N+1, Brillhart-Lehmer-Selfridge] Reading factors from helper file help.txt Running N+1 test using discriminant 5, base 4+sqrt(5) Calling Brillhart-Lehmer-Selfridge with factored part 50.07% 854*(279978 ... [digits deleted] ... 823983)^51-1 is prime! (68.4205s+0.0510s) ======== Also, the Primeform e-group found 25987968300*[RSA-200]^512-1 and 49334180280*[RSA-200]^512-1, each with 102128 digits (see link).
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LINKS
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Chris Caldwell, Primeform e-group bio.
Wikinews, 200 Digit Number Factored.
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CROSSREFS
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Adjacent sequences: A108372 A108373 A108374 this_sequence A108376 A108377 A108378
Sequence in context: A134820 A126113 A068684 this_sequence A052479 A108875 A142381
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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), Jul 02 2005
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