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 A002970 Numbers n such that 4*n^2 + 9 is prime. (Formerly M3248) 6
 1, 4, 5, 10, 16, 19, 20, 26, 29, 31, 35, 41, 44, 49, 50, 55, 56, 59, 70, 71, 80, 85, 94, 95, 100, 101, 106, 109, 110, 121, 149, 154, 160, 166, 175, 179, 184, 190, 191, 200, 205, 206, 211, 224, 236, 241, 245, 251, 256, 265, 269, 271, 284, 286, 289, 299, 304, 314 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 REFERENCES E. Kogbetliantz and A. Krikorian, Handbook of First Complex Prime Numbers, Gordon and Breach, NY, 1971, p. 1. N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). LINKS T. D. Noe, Table of n, a(n) for n = 1..1000 E. Kogbetliantz and A. Krikorian Handbook of First Complex Prime Numbers, Gordon and Breach, NY, 1971 [Annotated scans of a few pages] MATHEMATICA Select[Range[350], PrimeQ[4 #^2 + 9] &] (* Vincenzo Librandi, Mar 19 2014 *) PROG (MAGMA)[n: n in [0..600]|IsPrime(4*n^2+9)]; // Vincenzo Librandi, Nov 21 2010 (PARI) is(n)=isprime(4*n^2+9) \\ Charles R Greathouse IV, Feb 17 2017 CROSSREFS Sequence in context: A131780 A102006 A118735 * A073611 A058594 A285289 Adjacent sequences:  A002967 A002968 A002969 * A002971 A002972 A002973 KEYWORD nonn,easy AUTHOR STATUS approved

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Last modified January 22 19:47 EST 2020. Contains 331153 sequences. (Running on oeis4.)