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 A107219 #16 Feb 10 2017 16:23:55 %S A107219 101,109,149,181,269,389,401,409,449,461,521,541,569,761,829,929,941, %T A107219 1021,1061,1069,1129,1361,1429,1489,1601,1609,1621,1721,1741,1861, %U A107219 1889,1949,2081,2129,2269,2309,2441,2549,2609,2621,2689,2749,2789 %N A107219 Primes of the form x^2 + 100y^2. %C A107219 Discriminant = -400. See A107132 for more information. %H A107219 Vincenzo Librandi and Ray Chandler, <a href="/A107219/b107219.txt">Table of n, a(n) for n = 1..10000</a> [First 1000 terms from Vincenzo Librandi] %H A107219 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 A107219 QuadPrimes2[1, 0, 100, 10000] (* see A106856 *) %o A107219 (PARI) list(lim)=my(v=List(),w,t); for(x=1, sqrtint(lim\1), w=x^2; for(y=1, sqrtint((lim-w)\100), if(isprime(t=w+100*y^2), listput(v,t)))); Set(v) \\ _Charles R Greathouse IV_, Feb 10 2017 %K A107219 nonn,easy %O A107219 1,1 %A A107219 _T. D. Noe_, May 13 2005