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 A033239 #22 Jul 08 2025 19:47:23 %S A033239 61,97,257,269,293,317,461,613,773,977,1033,1097,1201,1217,1601,1613, %T A033239 1669,1721,1993,1997,2221,2269,2309,2549,2557,2657,2969,3001,3037, %U A033239 3049,3089,3253,3313,3389,3461,3877 %N A033239 Primes of form x^2+61*y^2. %D A033239 David A. Cox, "Primes of the Form x^2 + n y^2", Wiley, 1989. %H A033239 Vincenzo Librandi and Ray Chandler, <a href="/A033239/b033239.txt">Table of n, a(n) for n = 1..10000</a> [First 1000 terms from Vincenzo Librandi] %H A033239 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 A033239 QuadPrimes2[1, 0, 61, 10000] (* see A106856 *) %K A033239 nonn,easy %O A033239 1,1 %A A033239 _N. J. A. Sloane_