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 A107200 #20 Dec 15 2023 20:07:34 %S A107200 2,43,61,331,389,419,587,691,1093,1109,1187,1237,1637,1723,2069,2179, %T A107200 2221,2269,2309,2557,2699,2837,3253,3259,3491,3533,3571,3581,3821, %U A107200 3907,4093,4259,4283,4451,4603,4651,4733,5051,5189,5387,5531,5653 %N A107200 Primes of the form 2x^2 + 43y^2. %C A107200 Discriminant = -344. See A107132 for more information. %H A107200 Vincenzo Librandi and Ray Chandler, <a href="/A107200/b107200.txt">Table of n, a(n) for n = 1..10000</a> [First 1000 terms from Vincenzo Librandi] %H A107200 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 A107200 QuadPrimes2[2, 0, 43, 10000] (* see A106856 *) %o A107200 (PARI) list(lim)=my(v=List(),w,t); for(x=0, sqrtint(lim\2), w=2*x^2; for(y=0, sqrtint((lim-w)\43), if(isprime(t=w+43*y^2), listput(v,t)))); Set(v) \\ _Charles R Greathouse IV_, Feb 10 2017 %Y A107200 Cf. A107132. %K A107200 nonn,easy %O A107200 1,1 %A A107200 _T. D. Noe_, May 13 2005