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 A033228 #22 Jul 08 2025 19:46:06 %S A033228 41,173,373,389,433,617,769,853,881,941,1061,1097,1153,1597,1601,2153, %T A033228 2333,2437,2633,2789,2909,2957,3257,3329,3413,3517,3733,3877,4133, %U A033228 4397,4649,4957,4993,5189,5197 %N A033228 Primes of form x^2+41*y^2. %D A033228 David A. Cox, "Primes of the Form x^2 + n y^2", Wiley, 1989. %H A033228 Vincenzo Librandi and Ray Chandler, <a href="/A033228/b033228.txt">Table of n, a(n) for n = 1..10000</a> [First 1000 terms from Vincenzo Librandi] %H A033228 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 A033228 QuadPrimes2[1, 0, 41, 10000] (* see A106856 *) %K A033228 nonn,easy %O A033228 1,1 %A A033228 _N. J. A. Sloane_