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Search: id:A116958
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| A116958 |
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Numbers n such that 2*n + 5 and 2*n + 7 are twin primes. |
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+0
1
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| 0, 3, 6, 12, 18, 27, 33, 48, 51, 66, 72, 87, 93, 96, 111, 117, 132, 138, 153, 171, 207, 213, 228, 258, 282, 297, 306, 318, 327, 402, 408, 411, 426, 438, 507, 513, 522, 528, 543, 573, 612, 636, 642, 648, 657, 711, 723, 738, 741, 801, 807, 831, 846, 858, 891, 933
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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All n's are multiples of 3 because all twin primes except (3,5) are of the form (6n-1,6n+1). - Jonathan Vos Post Mar 31 2006
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LINKS
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Eric Weisstein's World of Mathematics, Twin Primes.
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MATHEMATICA
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Reap[Do[If[PrimeQ[2n+5]&&PrimeQ[2n+7], Sow[n]], {n, 0, 1000}]][[2, 1]]
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CROSSREFS
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a(n)=3*A002822(n-1).
Sequence in context: A028882 A154907 A024513 this_sequence A006156 A061776 A074899
Adjacent sequences: A116955 A116956 A116957 this_sequence A116959 A116960 A116961
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KEYWORD
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nonn
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AUTHOR
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Zak Seidov (zakseidov(AT)yahoo.com), Mar 30 2006
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