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 A011586 #12 Jan 24 2021 13:25:54 %S A011586 0,1,1,1,1,-1,1,-1,1,1,-1,-1,1,1,-1,-1,1,-1,1,-1,-1,-1,-1,0,1,1,1,1, %T A011586 -1,1,-1,1,1,-1,-1,1,1,-1,-1,1,-1,1,-1,-1,-1,-1,0,1,1,1,1,-1,1,-1,1,1, %U A011586 -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 %N A011586 Legendre symbol (n,23). %D A011586 G. H. Hardy and E. M. Wright, An Introduction to the Theory of Numbers. 3rd ed., Oxford Univ. Press, 1954, p. 68. %H A011586 <a href="/index/Rec#order_22">Index entries for linear recurrences with constant coefficients</a>, signature (-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1). %t A011586 JacobiSymbol[Range[0,80],23] (* _Harvey P. Dale_, Jan 24 2021 *) %K A011586 sign,mult %O A011586 0,1 %A A011586 _N. J. A. Sloane_