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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
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.
MATHEMATICA
lst={}; Do[p=Prime[n]; If[ !PrimeQ[3*p-2], AppendTo[lst, p]], {n, 6!}]; lst
CROSSREFS
Cf. A153238 [From Vincenzo Librandi, Jan 01 2009]
Sequence in context: A145100 A145101 A176902 * A080115 A119480 A043297
KEYWORD
nonn
AUTHOR
EXTENSIONS
Minor edits by N. J. A. Sloane, Jul 08 2010
STATUS
approved