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 A348194 #11 Oct 07 2021 07:23:06 %S A348194 1,0,0,1,0,0,-1,2,-1,-1,2,1,-1,2,0,-1,-1,0,0,-1,1,3,0,-1,0,1,-2,1,0,0, %T A348194 0,1,-2,-1,0,1,-1,4,5,-2,-3,3,-2,1,1,0,-3,-1,0,3,-1,-2,0,3,-3,-2,5,-3, %U A348194 2,0,-1,5,-1,0,-2,-1,1,3,-3,3,5,-5,1,3,-4,4,2,-2,-1,-3,0,-1,6,1,-4,-3,2,-4,-4,2,0,-1,1,1,-1,-1,2,-1,3,1,2,-2,5,1,-1 %N A348194 a(n) = A077767(n) - A077766(n). %H A348194 Seiichi Manyama, <a href="/A348194/b348194.txt">Table of n, a(n) for n = 1..10000</a> %F A348194 a(n) = A348193(n+1) - A348193(n). %o A348194 (PARI) a(n) = sum(k=n^2, (n+1)^2, (isprime(k)&&k%4==3)-(isprime(k)&&k%4==1)); %Y A348194 Cf. A014085, A077766, A077767, A091295, A348193. %K A348194 sign %O A348194 1,8 %A A348194 _Seiichi Manyama_, Oct 06 2021