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 A106989 #24 Jan 15 2016 09:04:14 %S A106989 23,29,43,53,79,107,113,127,179,191,211,233,263,277,337,347,373,389, %T A106989 443,491,547,569,571,599,641,653,659,673,701,751,757,809,823,883,907, %U A106989 911,919,953,991,1031,1093,1117,1171,1187,1213,1283,1297,1303,1327 %N A106989 Primes of the form x^2-xy+23y^2, with x and y nonnegative. %C A106989 Discriminant=-91. %C A106989 Also, primes that are squares (mod 91), or equivalently, with Legendre symbols (p|7) = (p|13) = 1. Included as subsequence in A191054 which are primes with Jacobi symbol (p|7*13) = 1, including also primes with (p|7) = (p|13) = -1. - _David Broadhurst_ and _M. F. Hasler_, Jan 15 2016 %H A106989 Vincenzo Librandi and Ray Chandler, <a href="/A106989/b106989.txt">Table of n, a(n) for n = 1..10000</a> [First 1000 terms from Vincenzo Librandi] %H A106989 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 A106989 QuadPrimes2[1, -1, 23, 10000] (* see A106856 *) %o A106989 (PARI) is(p)=issquare(Mod(p,91))&&isprime(p) \\ _M. F. Hasler_, Jan 15 2016 %K A106989 nonn,easy %O A106989 1,1 %A A106989 _T. D. Noe_, May 09 2005