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A153261
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Primes p such that 3*p-2 is not prime.
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0
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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; internal format)
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OFFSET
| 1,1
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COMMENTS
| 3*2-2=4 not prime, 17*3-2=49 not prime,... 3*3-2=7 is prime and not in this sequence.
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MATHEMATICA
| lst={}; Do[p=Prime[n]; If[ !PrimeQ[3*p-2], AppendTo[lst, p]], {n, 6!}]; lst
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CROSSREFS
| Cf. A153184, A088878
Cf. A153238 [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Jan 01 2009]
Sequence in context: A145100 A145101 A176902 * A080115 A119480 A043297
Adjacent sequences: A153258 A153259 A153260 * A153262 A153263 A153264
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KEYWORD
| nonn
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AUTHOR
| Vladimir Orlovsky (4vladimir(AT)gmail.com), Dec 22 2008
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EXTENSIONS
| Minor edits by N. J. A. Sloane, Jul 08 2010
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