A002970 - OEIS

A002970

Numbers k such that 4*k^2 + 9 is prime.
(Formerly M3248)

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