This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A107143 #18 Feb 09 2017 14:36:56 %S A107143 2,19,37,173,179,181,269,307,509,547,563,683,971,1093,1123,1171,1229, %T A107143 1381,1523,1571,1579,1627,1637,1667,1877,1931,1933,2083,2339,2371, %U A107143 2389,2621,2731,2749,2789,2909,3061,3067,3109,3181,3221,3229,3371 %N A107143 Primes of the form 2x^2 + 19y^2. %C A107143 Discriminant = -152. See A107132 for more information. %H A107143 Vincenzo Librandi and Ray Chandler, <a href="/A107143/b107143.txt">Table of n, a(n) for n = 1..10000</a> [First 1000 terms from Vincenzo Librandi] %H A107143 N. J. A. Sloane et al., <a href="https://oeis.org/wiki/Binary_Quadratic_Forms_and_OEIS">Binary Quadratic Forms and OEIS</a> (Index to related sequences, programs, references) %t A107143 QuadPrimes2[2, 0, 19, 10000] (* see A106856 *) %o A107143 (PARI) list(lim)=my(v=List(),w,t); for(x=0, sqrtint(lim\2), w=2*x^2; for(y=0, sqrtint((lim-w)\19), if(isprime(t=w+19*y^2), listput(v,t)))); Set(v) \\ _Charles R Greathouse IV_, Feb 09 2017 %K A107143 nonn,easy %O A107143 1,1 %A A107143 _T. D. Noe_, May 13 2005