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Search: id:A145472
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| A145472 |
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Primes p such that (7+p)/2 is prime. |
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1
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| 3, 7, 19, 31, 67, 79, 127, 139, 151, 199, 211, 271, 307, 379, 439, 547, 607, 619, 691, 727, 739, 751, 787, 811, 859, 907, 919, 967, 991, 1039, 1087, 1231, 1279, 1447, 1459, 1471, 1531, 1567, 1699, 1747, 1759, 1831, 1867, 1987, 2011, 2131, 2179, 2239, 2251
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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All these primes are congruent to 3 mod 4 and (with exception first one) to 7 mod 12
Primes of the form 2*p-7 [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Oct 04 2009]
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MATHEMATICA
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aa = {}; k = 7; Do[If[PrimeQ[(k + Prime[n])/2], AppendTo[aa, Prime[n]]], {n, 1, 500}]; aa
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CROSSREFS
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A092109, A145471-A145480.
Cf. A063910 [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Oct 04 2009]
Sequence in context: A066148 A093932 A141173 this_sequence A077313 A102271 A112633
Adjacent sequences: A145469 A145470 A145471 this_sequence A145473 A145474 A145475
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KEYWORD
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nonn
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AUTHOR
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Artur Jasinski (grafix(AT)csl.pl), Oct 11 2008
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