OFFSET
1,1
COMMENTS
Primes of the form 4x^2+4xy+13y^2. Discriminant=-192. - T. D. Noe, May 02 2008
Also, primes of form u^2+12v^2 with odd v, while A107008 (which is also expressible as x^2+48y^2) has even v. One can transform its form as (2x+y)^2+12y^2 (where y can only be odd), while the second is x^2+12(2y)^2. Both sequences are 1 mod 12 and together they are primes x^2+12y^2 (A068228). [Tito Piezas III, Jan 01 2009]
LINKS
N. J. A. Sloane et al., Binary Quadratic Forms and OEIS (Index to related sequences, programs, references)
MATHEMATICA
a = {}; Do[If[PrimeQ[24 n + 13], AppendTo[a, 24 n + 13]], {n, 0, 200}]; a
Select[24Range[0, 150]+13, PrimeQ] (* Harvey P. Dale, Mar 11 2011 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Artur Jasinski, Apr 25 2008
STATUS
approved