OFFSET
1,1
COMMENTS
Discriminant = -520. See A139827 for more information.
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
The primes are congruent to {2, 33, 57, 67, 73, 83, 97, 123, 137, 163, 177, 187, 193, 203, 227, 267, 297, 307, 323, 353, 427, 457, 473, 483, 513} (mod 520).
MATHEMATICA
QuadPrimes2[2, 0, 65, 10000] (* see A106856 *)
PROG
(Magma) [ p: p in PrimesUpTo(3000) | p mod 520 in {2, 33, 57, 67, 73, 83, 97, 123, 137, 163, 177, 187, 193, 203, 227, 267, 297, 307, 323, 353, 427, 457, 473, 483, 513}]; // Vincenzo Librandi, Jul 29 2012
(PARI) list(lim)=my(v=List(), w, t); for(x=1, sqrtint(lim\2), w=2*x^2; for(y=0, sqrtint((lim-w)\65), if(isprime(t=w+65*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