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A155723 Numbers n such that 2n+9 is not prime. 3
0, 3, 6, 8, 9, 12, 13, 15, 18, 20, 21, 23, 24, 27, 28, 30, 33, 34, 36, 38, 39, 41, 42, 43, 45, 48, 51, 53, 54, 55, 56, 57, 58, 60, 62, 63, 66, 67, 68, 69, 72, 73, 75, 76, 78, 80, 81, 83, 84, 87, 88, 89, 90, 93, 96, 97, 98, 99, 100, 102, 103, 104, 105, 106, 108, 111, 113, 114 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

COMMENTS

2*A155724(m,n)+9 = (2n+1)*(2m+1) are not prime and create entries of this form.

One less than the associate entry in A153053, two less than the associated A153052. - R. J. Mathar, Jan 05 2011

EXAMPLE

For n=0, a(0)=9, n=3, a(3)=15.

CROSSREFS

Cf. A155724, A155722

Sequence in context: A167195 A032489 A153769 * A095277 A185717 A189637

Adjacent sequences:  A155720 A155721 A155722 * A155724 A155725 A155726

KEYWORD

nonn

AUTHOR

Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Jan 25 2009

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Last modified February 14 00:47 EST 2012. Contains 205567 sequences.