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Search: id:A087680
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| A087680 |
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n +/- 4 are both prime. |
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+0
5
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| 7, 9, 15, 27, 33, 57, 63, 75, 93, 105, 135, 153, 177, 195, 237, 267, 273, 363, 393, 405, 435, 453, 483, 495, 567, 573, 597, 603, 657, 687, 705, 723, 747, 765, 825, 915, 933, 987, 1017, 1035, 1065, 1113, 1167, 1197, 1227, 1233, 1287, 1293, 1323, 1377, 1443
(list; graph; listen)
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OFFSET
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1,1
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MAPLE
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ZL:=[]:for p from 1 to 1444 do if (isprime(p) and isprime(p+8) ) then ZL:=[op(ZL), (p+(p+8))/2]; fi; od; print(ZL); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Mar 07 2007
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MATHEMATICA
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f[n_]:=PrimeQ[n-4]&&PrimeQ[n+4]; lst={}; Do[If[f[n], AppendTo[lst, n]], {n, 3, 8!, 2}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Oct 09 2009]
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CROSSREFS
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Cf. A014574, A087678-A087683, A087695-A087697, A088764.
Sequence in context: A024902 A111312 A158891 this_sequence A020691 A145830 A140364
Adjacent sequences: A087677 A087678 A087679 this_sequence A087681 A087682 A087683
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KEYWORD
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easy,nonn
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AUTHOR
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Zak Seidov (zakseidov(AT)yahoo.com), Sep 27 2003
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EXTENSIONS
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More terms from Ray Chandler (rayjchandler(AT)sbcglobal.net), Oct 26 2003
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