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 A124897 #10 Jul 26 2022 12:45:45 %S A124897 -1,-1,1,-1,1,-1,0,1,1,-1,1,1,-1,-1,1,-1,-1,0,1,-1,-1,1,-1,-1,1,-1,-1, %T A124897 1,1,1,-1,0,-1,1,1,-1,-1,0,1,-1,0,1,0,1,1,1,1,1,1,1,1,1,-1,-1,-1,-1,0, %U A124897 1,1,1,1,1,-1,1,1,-1,-1,0,1,0,1,-1,1,-1,-1,1,-1,1,1,1,-1,0,1,-1,1,1,-1,1,-1,-1,-1,1,0,-1,1,1,-1,-1,0,1,1,1,-1,1,-1,1 %N A124897 a(n) = mu(n^2 + 1), mu = A008683. %H A124897 Amiram Eldar, <a href="/A124897/b124897.txt">Table of n, a(n) for n = 1..10000</a> %F A124897 a(n) = A008683(A002522(n)) = A124895(n,1); %F A124897 a(n) = 0 iff A059592(n) > 1; %t A124897 MoebiusMu[Range[107]^2+1] (* _T. D. Noe_, Nov 27 2006 *) %o A124897 (PARI) a(n) = moebius(n^2+1); \\ _Michel Marcus_, Jul 26 2022 %Y A124897 Cf. A002522, A008683, A059592, A124895. %K A124897 sign %O A124897 1,1 %A A124897 _Reinhard Zumkeller_, Nov 12 2006 %E A124897 Corrected by _T. D. Noe_, Nov 27 2006