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A153261 Primes p such that 3*p-2 is not prime. 0
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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified October 14 17:43 EDT 2019. Contains 328022 sequences. (Running on oeis4.)