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#13 by Harvey P. Dale at Thu Dec 13 18:00:03 EST 2018
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#12 by Harvey P. Dale at Thu Dec 13 17:59:59 EST 2018
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Harvey P. Dale, <a href="/A242515/b242515.txt">Table of n, a(n) for n = 1..2000</a>
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approved
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#11 by Harvey P. Dale at Thu Dec 13 17:58:40 EST 2018
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#10 by Harvey P. Dale at Thu Dec 13 17:58:37 EST 2018
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| MATHEMATICA
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Select[Range[500], AllTrue[12#+{1, 5, 7, 11}, CompositeQ]&] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Dec 13 2018 *)
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approved
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#9 by Charles R Greathouse IV at Mon Apr 25 11:45:33 EDT 2016
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Discussion
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| Mon Apr 25
| 11:45
| OEIS Server: https://oeis.org/edit/global/2503
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#8 by N. J. A. Sloane at Wed May 21 20:34:56 EDT 2014
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#7 by Wesley Ivan Hurt at Wed May 21 13:45:02 EDT 2014
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#6 by Wesley Ivan Hurt at Wed May 21 13:43:52 EDT 2014
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NumberNumbers n such that 12n+1,, 12n+5,, 12n+7,, 12n+11 are all composite numbers.
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a(1) = 44, ; 44*12+1=529, 44*12+5=533, 44*12+7=535, 44*12+11=539,, and 529, 533, 535 and 539 are all composites.
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proposed
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#5 by Michel Marcus at Sat May 17 02:49:24 EDT 2014
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Discussion
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| Sat May 17
| 03:01
| Lear Young: Thanks for the xref.It's very useful. Prof Feng research particles,he isnt my professor.
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| 03:03
| Michel Marcus: Add a discussion telling who is Prof Feng and where you found his sieve, even if not on the Internet.
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| 03:13
| Lear Young: Thanks,I prefer draft of A040117 be rejected.
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| 03:24
| Michel Marcus: OK as you wish. Cheers.
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| 03:51
| Michel Marcus: And please tell so in A040117 , thanks.
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| 04:24
| Lear Young: OK
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#4 by Michel Marcus at Sat May 17 02:48:17 EDT 2014
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| CROSSREFS
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Subsequence of A153383.
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proposed
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Discussion
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| Sat May 17
| 02:49
| Michel Marcus: Add xref.
Who is Prof Feng ? Is/was your professor ?
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