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A153044
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Numbers n such that 2*n-9 is not a prime
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1
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5, 9, 12, 15, 17, 18, 21, 22, 24, 27, 29, 30, 32, 33, 36, 37, 39, 42, 43, 45, 47, 48, 50, 51, 52, 54, 57, 60, 62, 63, 64, 65, 66, 67, 69, 71, 72, 75, 76, 77, 78, 81, 82, 84, 85, 87, 89, 90, 92, 93, 96, 97, 98, 99, 102, 105, 106, 107, 108, 109, 111, 112, 113, 114, 115, 117, 120
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| One more than the associated entry in A153039. - R. J. Mathar, Jan 05 2011
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MATHEMATICA
| Select[Range[150], !PrimeQ[2#-9]&] (* From Harvey P. Dale, Mar 5 2011 *)
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PROG
| (MAGMA) [n: n in [5..121] | not IsPrime(2*n-9)]; // Bruno Berselli, Mar 05 2011
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CROSSREFS
| Cf. A097069
Sequence in context: A123574 A143834 A102183 * A106635 A182617 A141292
Adjacent sequences: A153041 A153042 A153043 * A153045 A153046 A153047
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KEYWORD
| nonn
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AUTHOR
| Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Dec 17 2008
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EXTENSIONS
| Corrected and extended by N. J. A. Sloane, May 29 2010
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