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 A002971 Numbers k such that 4*k^2 + 25 is prime. (Formerly M0587) 2
 1, 2, 3, 4, 8, 9, 11, 12, 13, 14, 16, 17, 18, 21, 23, 26, 29, 34, 36, 37, 38, 47, 48, 49, 51, 53, 54, 56, 62, 63, 66, 67, 68, 69, 73, 74, 77, 79, 82, 83, 91, 99, 101, 102, 103, 107, 108, 114, 116, 118, 122, 131, 134, 141, 142, 147, 148, 151, 154, 156, 157, 158, 159, 164 (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[200], PrimeQ[4 #^2 + 25] &] (* Vincenzo Librandi, Mar 19 2014 *) PROG (MAGMA) [n: n in [0..600] |IsPrime(4*n^2+25)]; // Vincenzo Librandi, Nov 21 2010 (PARI) is(n)=isprime(4*n^2+25) \\ Charles R Greathouse IV, Jun 06 2017 CROSSREFS Sequence in context: A246444 A045577 A111020 * A157318 A158031 A139461 Adjacent sequences:  A002968 A002969 A002970 * A002972 A002973 A002974 KEYWORD nonn,easy AUTHOR STATUS approved

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Last modified January 22 02:06 EST 2020. Contains 331133 sequences. (Running on oeis4.)