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Search: id:A087696
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| A087696 |
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Numbers n such that n +/- 5 are both primes. |
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+0
5
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| 8, 12, 18, 24, 36, 42, 48, 66, 78, 84, 102, 108, 132, 144, 162, 168, 186, 228, 234, 246, 276, 288, 312, 342, 354, 378, 384, 414, 426, 438, 444, 462, 504, 552, 582, 612, 636, 648, 678, 696, 714, 738, 756, 792, 816, 834, 858, 882, 924, 942, 972
(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 973 do if (isprime(p) and isprime(p+10) ) then ZL:=[op(ZL), (p+(p+10))/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-5]&&PrimeQ[n+5]; lst={}; Do[If[f[n], AppendTo[lst, n]], {n, 4, 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, A088765.
Sequence in context: A090738 A085103 A157940 this_sequence A015897 A028393 A066681
Adjacent sequences: A087693 A087694 A087695 this_sequence A087697 A087698 A087699
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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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