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 A036143 #10 Jul 08 2025 21:35:20 %S A036143 1,3,9,27,81,116,94,28,84,125,121,109,73,92,22,66,71,86,4,12,36,108, %T A036143 70,83,122,112,82,119,103,55,38,114,88,10,30,90,16,48,17,51,26,78,107, %U A036143 67,74,95,31,93,25,75,98,40,120 %N A036143 a(n) = 3^n mod 127. %D A036143 I. M. Vinogradov, Elements of Number Theory, pp. 220 ff. %p A036143 [ seq(primroot(ithprime(i))^j mod ithprime(i),j=0..100) ]; %o A036143 (PARI) a(n)=lift(Mod(3,127)^n) \\ _Charles R Greathouse IV_, Mar 22 2016 %K A036143 nonn,easy %O A036143 0,2 %A A036143 _N. J. A. Sloane_