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A139404
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Numbers n such that 24n+5 and 24n+7 are twin primes
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8
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0, 1, 4, 6, 8, 11, 19, 34, 44, 51, 53, 54, 78, 81, 83, 89, 93, 96, 99, 106, 116, 141, 144, 148, 149, 159, 163, 173, 176, 184, 188, 193, 209, 228, 229, 239, 258, 261, 279, 286, 306, 316, 323, 328, 331, 351, 358, 368, 369, 389, 393, 394, 401, 403, 418, 429, 446
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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COMMENTS
| 1/3 of number k such that 8k+5 and 8k+7 are primes.
All numbers in A125821 are divisible by 3
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FORMULA
| a(n)=A125821(n)/3
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MATHEMATICA
| a = {}; Do[If[PrimeQ[8 n + 5] && PrimeQ[8 n + 3] && PrimeQ[n], AppendTo[a, n]], {n, 1, 10000}]; a
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PROG
| (MAGMA) [n: n in [0..5000] |IsPrime(24*n+5)and IsPrime(24*n+7)] [From Vincenzo Librandi, Nov 24 2010]
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CROSSREFS
| Cf. A125822, A139402, A139404.
Sequence in context: A134779 A075325 A026278 * A014455 A110646 A031359
Adjacent sequences: A139401 A139402 A139403 * A139405 A139406 A139407
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KEYWORD
| nonn
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AUTHOR
| Artur Jasinski (grafix(AT)csl.pl), Apr 19 2008
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EXTENSIONS
| The first term is 0 [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Mar 25 2010]
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