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 A106970 #17 Aug 05 2014 14:16:29 %S A106970 23,41,83,131,193,199,227,229,277,293,397,401,521,557,607,659,701,739, %T A106970 751,773,787,811,983,1013,1019,1061,1117,1231,1289,1409,1423,1427, %U A106970 1447,1511,1523,1531,1553,1667,1669,1693,1709,1723,1747,1753,1847 %N A106970 Primes of the form x^2-xy+21y^2, with x and y nonnegative. %C A106970 Discriminant=-83. %H A106970 Vincenzo Librandi and Ray Chandler, <a href="/A106970/b106970.txt">Table of n, a(n) for n = 1..10000</a> [First 1000 terms from Vincenzo Librandi] %H A106970 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 A106970 QuadPrimes2[1, -1, 21, 10000] (* see A106856 *) %K A106970 nonn,easy %O A106970 1,1 %A A106970 _T. D. Noe_, May 09 2005