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 A165574 #5 Oct 04 2020 11:45:13 %S A165574 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,-1, %T A165574 -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,-1, %U A165574 -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 %N A165574 Legendre symbol (n,263). %C A165574 263 is the 12th Safe prime, A005385(12). %H A165574 A. Karttunen, <a href="/A165574/b165574.txt">Table of n, a(n) for n = 0..263</a> %t A165574 JacobiSymbol[Range[0,90],263] (* _Harvey P. Dale_, Oct 04 2020 *) %Y A165574 Partial sums: A165576. %K A165574 sign,mult %O A165574 0,1 %A A165574 _Antti Karttunen_, Sep 22 2009