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A089531 2*A023204(n) + 3. 7
7, 13, 17, 29, 37, 41, 61, 89, 97, 109, 137, 149, 181, 197, 229, 257, 277, 281, 317, 337, 349, 389, 397, 401, 449, 457, 461, 541, 557, 569, 617, 677, 701, 709, 761, 769, 797, 821, 881, 929, 937, 977, 1009, 1021, 1049, 1097, 1117, 1129, 1201, 1217, 1229, 1237 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

COMMENTS

Primes p such that (p-3)/2 is also prime. [From Juri-Stepan Gerasimov (2stepan(AT)rambler.ru), Apr 18 2010]

MATHEMATICA

Clear[lst, n, f] f[n_]:=PrimeQ[(n-3)/2]; lst={}; Do[p=Prime[n]; If[f[p], AppendTo[lst, p]], {n, 6!}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Oct 13 2009]

CROSSREFS

Cf. A023204, A089530, A089532.

Sequence in context: A167276 A181570 A154408 * A138337 A174877 A029477

Adjacent sequences:  A089528 A089529 A089530 * A089532 A089533 A089534

KEYWORD

nonn

AUTHOR

Ray Chandler (rayjchandler(AT)sbcglobal.net), Nov 07 2003

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Last modified February 16 14:37 EST 2012. Contains 205930 sequences.