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A153170
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Numbers n such that 3n+2 is not prime
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0
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2, 4, 6, 8, 10, 11, 12, 14, 16, 18, 20, 21, 22, 24, 25, 26, 28, 30, 31, 32, 34, 36, 38, 39, 40, 41, 42, 44, 46, 47, 48, 50, 51, 52, 53, 54, 56, 58, 60, 61, 62, 64, 66, 67, 68, 69, 70, 71, 72, 73, 74, 76, 78, 80, 81, 82, 84, 86, 88, 90, 91, 92, 94, 95, 96, 98, 99, 100, 101, 102
(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]
Contains the nonzero entries of A005843 and the odd numbers of the form 2*A059324(.)+1.
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PROG
| (PARI) for(n=1, 200, if(!isprime(3*n+2), print1(n, ", ")))
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CROSSREFS
| Cf. A024893
Sequence in context: A097660 A176995 A154809 * A067030 A072427 A050420
Adjacent sequences: A153167 A153168 A153169 * A153171 A153172 A153173
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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
| Edited by N. J. A. Sloane, Jun 23 2010
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