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 A348166 #25 Jun 02 2025 15:24:25 %S A348166 0,0,0,0,0,0,0,0,0,90,0,90,180,270,360,450,540,630,720,180,90,0,90, %T A348166 180,270,360,450,540,630,270,180,90,0,90,180,270,360,450,540,360,270, %U A348166 180,90,0,90,180,270,360,450,450,360,270,180,90,0,90,180,270,360,540,450,360,270,180,90,0,90,180,270,630,540,450,360,270,180,90 %N A348166 a(n) = abs(A020338(n)-A338754(n)). %C A348166 All terms are multiples of 90. %F A348166 a(A010785(n)) = 0 %e A348166 a(1) = abs(11-11) = 0 %e A348166 a(15) = abs(1515-1155) = 360 %e A348166 a(1965) = abs(19651965-11996655) = 7655310 %o A348166 (PARI) a(n)=abs(eval(Str(n, n))-fromdigits(digits(n), 100)*11) \\ _Charles R Greathouse IV_, Oct 04 2021 %Y A348166 Cf. A020338, A338754, A010785. %K A348166 nonn,base,easy %O A348166 1,10 %A A348166 _Nicolas Bělohoubek_, Oct 04 2021 %E A348166 Corrected by _Charles R Greathouse IV_, Oct 04 2021