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 A111149 Numbers n such that 5*n^2 + 9 is prime. 0
 2, 4, 10, 16, 26, 28, 38, 40, 44, 46, 58, 70, 80, 82, 88, 94, 98, 110, 116, 128, 130, 136, 140, 142, 154, 164, 178, 194, 200, 208, 212, 214, 220, 224, 236, 248, 250, 254, 256, 268, 278, 284, 298, 310, 320, 322, 332, 334, 338, 362, 392, 406, 422, 424, 458, 460 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS EXAMPLE If n=154 then 5*n^2 + 9 = 118589 (prime). MATHEMATICA Select[Range[500], PrimeQ[5*#^2 + 9] &] (* Stefan Steinerberger, Feb 26 2006 *) PROG (PARI) is(n)=isprime(5*n^2+9) \\ Charles R Greathouse IV, Jun 13 2017 CROSSREFS Sequence in context: A039682 A218665 A189558 * A123689 A137928 A293154 Adjacent sequences:  A111146 A111147 A111148 * A111150 A111151 A111152 KEYWORD nonn,easy AUTHOR Parthasarathy Nambi, Oct 18 2005 EXTENSIONS More terms from Stefan Steinerberger, Feb 26 2006 STATUS approved

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Last modified November 28 16:42 EST 2021. Contains 349413 sequences. (Running on oeis4.)