OFFSET
1,1
COMMENTS
LINKS
Vincenzo Librandi and Ray Chandler, Table of n, a(n) for n = 1..10000 [First 1000 terms from Vincenzo Librandi]
N. J. A. Sloane et al., Binary Quadratic Forms and OEIS (Index to related sequences, programs, references)
FORMULA
Except for 3, the primes are congruent to {59, 83, 131} (mod 168).
MATHEMATICA
QuadPrimes2[3, 0, 56, 10000] (* see A106856 *)
PROG
(Magma) [3] cat [ p: p in PrimesUpTo(6000) | p mod 168 in {59, 83, 131}]; // Vincenzo Librandi, Jul 30 2012
(PARI) list(lim)=my(v=List(), w, t); for(x=1, sqrtint(lim\3), w=3*x^2; for(y=0, sqrtint((lim-w)\56), if(isprime(t=w+56*y^2), listput(v, t)))); Set(v) \\ Charles R Greathouse IV, Mar 07 2017
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
T. D. Noe, May 02 2008
STATUS
approved