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 A191021 #14 Dec 31 2017 16:52:44 %S A191021 2,3,13,29,31,41,47,59,71,73,101,127,131,139,151,163,167,173,179,193, %T A191021 197,211,223,233,239,257,269,271,277,307,311,317,331,347,349,353,397, %U A191021 409,439,443,449,461,463,487,491,499,509,541,547,577,587,593,599,601 %N A191021 Primes that are squares mod 23. %C A191021 Rational primes that decompose in the field Q(sqrt(-23)). - _N. J. A. Sloane_, Dec 26 2017 %H A191021 Vincenzo Librandi, <a href="/A191021/b191021.txt">Table of n, a(n) for n = 1..1000</a> %H A191021 <a href="https://oeis.org/wiki/Index_to_OEIS:_Section_Pri#primes_decomp_of">Index to sequences related to decomposition of primes in quadratic fields</a> %t A191021 Select[Prime[Range[200]], JacobiSymbol[#,23]==1&] %K A191021 nonn,easy %O A191021 1,1 %A A191021 _T. D. Noe_, May 24 2011