Revision History for A337859
(Underlined text is an addition;
strikethrough text is a deletion.)
Showing entries 1-10
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#16 by Peter Luschny at Mon Oct 12 00:30:59 EDT 2020
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#15 by Michel Marcus at Fri Oct 09 12:42:34 EDT 2020
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#14 by Chai Wah Wu at Fri Oct 09 12:17:50 EDT 2020
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#13 by Chai Wah Wu at Fri Oct 09 12:17:25 EDT 2020
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| DATA
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3, 5, 37, 44101, 157081, 2031121, 7282801, 8122501, 18671941, 78550201, 208168381, 770810041, 2658625201, 2710529641, 5241663001, 14643783001, 18719308441, 56181482281, 73303609681, 74623302001, 110102454001, 140659081201
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| EXTENSIONS
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a(18)-a(22) from Chai Wah Wu, Oct 09 2020
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| STATUS
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approved
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#12 by N. J. A. Sloane at Mon Oct 05 00:05:03 EDT 2020
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#11 by Hugo Pfoertner at Mon Sep 28 12:58:31 EDT 2020
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#10 by Hugo Pfoertner at Mon Sep 28 12:56:59 EDT 2020
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| COMMENTS
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It seems that all larger terms are of the form 60*k + 1, starting at a(4) = 44101 = 60*735 + 1. Further terms of this form after a(17) are 56181482281, 73303609681, 74623302001, 110102454001, 140659081201, 283268822761, 469078212241, 530106748081, 570417709681, 701030830501, 720023604301; all are prime. - Hugo Pfoertner, Sep 28 2020
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proposed
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#9 by Amiram Eldar at Sun Sep 27 03:35:09 EDT 2020
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#8 by Amiram Eldar at Sun Sep 27 03:34:53 EDT 2020
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| MATHEMATICA
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Select[Range[4, 10^7], (t = #*(# - 1)*(# - 2)*(# - 3)/24) == 1 || PowerMod[2, #, t] == 4 &] - 1 (* Amiram Eldar, Sep 27 2020 *)
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| PROG
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(PARI) is(k) = k>=4 && Mod(2, k*(k-1)*(k-2)*(k-3)/24)^nk == 4
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| STATUS
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proposed
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#7 by Amiram Eldar at Sun Sep 27 03:24:32 EDT 2020
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