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Search: id:A045536
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| A045536 |
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Twin primes which are also Sophie Germain primes. |
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+0
11
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| 3, 5, 11, 29, 41, 179, 191, 239, 281, 419, 431, 641, 659, 809, 1019, 1031, 1049, 1229, 1289, 1451, 1481, 1931, 2129, 2141, 2339, 2549, 2969, 3299, 3329, 3359, 3389, 3539, 3821, 3851, 4019, 4271, 4481, 5231, 5279, 5441, 5501, 5639, 5741, 5849, 6131
(list; graph; listen)
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OFFSET
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0,1
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MATHEMATICA
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lst={3}; Do[p1=Prime[n]; p2=Prime[n+1]; d=2; If[p2-p1==d, If[PrimeQ[2*p1+1], AppendTo[lst, p1]]; If[PrimeQ[2*p2+1], AppendTo[lst, p2]]], {n, 3, 20^2}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Aug 07 2008]
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CROSSREFS
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Cf. A005384.
Sequence in context: A088357 A093706 A109945 this_sequence A019338 A046134 A080443
Adjacent sequences: A045533 A045534 A045535 this_sequence A045537 A045538 A045539
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KEYWORD
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nonn
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AUTHOR
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Thomas Kellar (tkellar(AT)fsp.com)
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EXTENSIONS
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Corrected by Jud McCranie (j.mccranie(AT)comcast.net), Dec 30 2000
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