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A153184
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Numbers n such that 3n-2 is not prime
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3
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2, 4, 6, 8, 9, 10, 12, 14, 16, 17, 18, 19, 20, 22, 24, 26, 28, 29, 30, 31, 32, 34, 36, 38, 39, 40, 41, 42, 44, 45, 46, 48, 49, 50, 52, 54, 56, 57, 58, 59, 60, 62, 63, 64, 66, 68, 69, 70, 72, 73, 74, 76, 78, 79, 80, 82, 83, 84, 85, 86, 87, 88, 89, 90, 92, 94, 96, 97, 98, 99, 100
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| Of course for all even n 3n-2 is not prime. [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Jun 18 2010]
One more than the associated value in A153309. - R. J. Mathar, Jan 05 2011
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MATHEMATICA
| lst={}; Do[If[ !PrimeQ[3*n-2], AppendTo[lst, n]], {n, 5!}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Dec 22 2008]
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CROSSREFS
| Cf. A153183, A088878.
Sequence in context: A085492 A065090 A003254 * A047412 A110262 A176693
Adjacent sequences: A153181 A153182 A153183 * A153185 A153186 A153187
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KEYWORD
| nonn
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AUTHOR
| Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Dec 20 2008
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EXTENSIONS
| Erroneous comment deleted by N. J. A. Sloane, Jun 23 2010
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