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A145471 Primes p such that (5+p)/2 is prime. +0
21
5, 17, 29, 41, 53, 89, 101, 113, 137, 173, 197, 257, 269, 293, 353, 389, 449, 461, 509, 521, 557, 617, 701, 761, 773, 797, 857, 881, 929, 953, 977, 1013, 1109, 1181, 1193, 1229, 1277, 1289, 1301, 1361, 1433, 1481, 1613, 1637, 1709, 1721, 1877, 1889, 1901 (list; graph; listen)
OFFSET

1,1

COMMENT

All these primes are congruent to 1 mod 4 and to 5 mod 12

MATHEMATICA

aa = {}; k = 5; Do[If[PrimeQ[(k + Prime[n])/2], AppendTo[aa, Prime[n]]], {n, 1, 500}]; aa

CROSSREFS

A092109

Sequence in context: A017581 A068230 A040117 this_sequence A126193 A074965 A145475

Adjacent sequences: A145468 A145469 A145470 this_sequence A145472 A145473 A145474

KEYWORD

nonn

AUTHOR

Artur Jasinski (grafix(AT)csl.pl), Oct 11 2008

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Last modified November 24 23:16 EST 2009. Contains 167481 sequences.


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