

A153051


Numbers n>=9 such that 2*n17 is not a prime.


3



9, 13, 16, 19, 21, 22, 25, 26, 28, 31, 33, 34, 36, 37, 40, 41, 43, 46, 47, 49, 51, 52, 54, 55, 56, 58, 61, 64, 66, 67, 68, 69, 70, 71, 73, 75, 76, 79, 80, 81, 82, 85, 86, 88, 89, 91, 93, 94, 96, 97, 100, 101, 102, 103, 106, 109, 110, 111, 112, 113, 115, 116, 117, 118, 119
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OFFSET

1,1


COMMENTS

Adding 1 to each entry yields A153041. [From R. J. Mathar, Dec 19 2008]
The terms after a(1) are the values of 2*h*k + k + h + 9, where h and k are positive integers. Vincenzo Librandi, Jan 19 2013


LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..1000


MATHEMATICA

Select[Range[9, 200], !PrimeQ[2 #  17] &] (* Vincenzo Librandi, Jan 19 2013 *)


PROG

(MAGMA) [n: n in [9..150]  not IsPrime(2*n  17)]; // Vincenzo Librandi, Jan 19 2013


CROSSREFS

Cf. A098605, A163674.
Sequence in context: A049733 A065977 A294999 * A106636 A186427 A050109
Adjacent sequences: A153048 A153049 A153050 * A153052 A153053 A153054


KEYWORD

nonn,easy


AUTHOR

Vincenzo Librandi, Dec 17 2008


EXTENSIONS

57 removed by R. J. Mathar, Dec 19 2008


STATUS

approved



