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 A107214 #18 Feb 10 2017 16:20:37 %S A107214 2,67,211,337,443,449,491,499,569,641,683,953,1019,1163,1201,1297, %T A107214 1409,1499,1873,2377,2473,2683,2689,2753,2851,3049,3329,3803,4001, %U A107214 4019,4099,4139,4201,4211,4481,4547,4657,4673,4691,4937,4993,5441 %N A107214 Primes of the form 2x^2 + 49y^2. %C A107214 Discriminant = -392. See A107132 for more information. %H A107214 Vincenzo Librandi and Ray Chandler, <a href="/A107214/b107214.txt">Table of n, a(n) for n = 1..10000</a> [First 1000 terms from Vincenzo Librandi] %H A107214 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 A107214 QuadPrimes2[2, 0, 49, 10000] (* see A106856 *) %o A107214 (PARI) list(lim)=my(v=List(),w,t); for(x=1, sqrtint(lim\2), w=2*x^2; for(y=0, sqrtint((lim-w)\49), if(isprime(t=w+49*y^2), listput(v,t)))); Set(v) \\ _Charles R Greathouse IV_, Feb 10 2017 %K A107214 nonn,easy %O A107214 1,1 %A A107214 _T. D. Noe_, May 13 2005