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 A011591 #8 Jul 08 2025 02:27:41 %S A011591 0,1,-1,-1,1,-1,1,-1,-1,1,1,1,-1,1,1,1,1,1,-1,-1,-1,1,-1,1,1,1,-1,-1, %T A011591 -1,-1,-1,1,-1,-1,-1,1,1,-1,1,-1,1,1,-1,0,1,-1,-1,1,-1,1,-1,-1,1,1,1, %U A011591 -1,1,1,1,1,1,-1,-1,-1,1,-1,1,1,1,-1,-1,-1,-1,-1,1,-1,-1,-1,1,1,-1 %N A011591 Legendre symbol (n,43). %D A011591 G. H. Hardy and E. M. Wright, An Introduction to the Theory of Numbers. 3rd ed., Oxford Univ. Press, 1954, p. 68. %K A011591 sign,mult %O A011591 0,1 %A A011591 _N. J. A. Sloane_