A153261 Primes p such that 3*p-2 is not prime.

2, 17, 19, 29, 31, 41, 59, 73, 79, 83, 89, 97, 101, 107, 109, 131, 139, 149, 151, 157, 173, 179, 197, 199, 223, 227, 229, 233, 239, 241, 269, 281, 283, 311, 317, 349, 353, 359, 367, 379, 383, 389, 397, 409, 419, 421, 439, 449, 457, 463, 479, 499, 503, 509, 521

Offset

1,1

Comments

3*2-2=4 not prime, 17*3-2=49 not prime,... 3*3-2=7 is prime and not in this sequence.

Links

Table of n, a(n) for n=1..55.

Mathematica

lst={}; Do[p=Prime[n]; If[ !PrimeQ[3*p-2], AppendTo[lst, p]], {n, 6!}]; lst

Crossrefs

Cf. A153184, A088878

Cf. A153238 [From Vincenzo Librandi, Jan 01 2009]

Sequence in context: A145100 A145101 A176902 * A080115 A119480 A043297

Adjacent sequences: A153258 A153259 A153260 * A153262 A153263 A153264

Keyword

nonn

Author

Vladimir Joseph Stephan Orlovsky, Dec 22 2008

Extensions

Minor edits by N. J. A. Sloane, Jul 08 2010

Status

approved