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A153082 Numbers n such that 2n+13 is not prime. 1
1, 4, 6, 7, 10, 11, 13, 16, 18, 19, 21, 22, 25, 26, 28, 31, 32, 34, 36, 37, 39, 40, 41, 43, 46, 49, 51, 52, 53, 54, 55, 56, 58, 60, 61, 64, 65, 66, 67, 70, 71, 73, 74, 76, 78, 79 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

COMMENTS

One less than the associated entry in A153083. - R. J. Mathar, Jan 05 2011

FORMULA

Let p = prime n = (p^2-13)/2 mod (p)

MATHEMATICA

Select[Range[0, 100], !PrimeQ[2#+13]&]  (* From Harvey P. Dale, Mar 17 2011 *)

CROSSREFS

Cf. A153081, A155550

Sequence in context: A189085 A153235 A133483 * A026147 A032785 A096887

Adjacent sequences:  A153079 A153080 A153081 * A153083 A153084 A153085

KEYWORD

nonn

AUTHOR

Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Dec 18 2008

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Last modified February 14 14:07 EST 2012. Contains 205623 sequences.