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 A036145 #8 Jul 08 2025 21:35:27 %S A036145 1,3,9,27,81,106,44,132,122,92,2,6,18,54,25,75,88,127,107,47,4,12,36, %T A036145 108,50,13,39,117,77,94,8,24,72,79,100,26,78,97,17,51,16,48,7,21,63, %U A036145 52,19,57,34,102,32,96,14,42,126 %N A036145 3^n mod 137. %D A036145 I. M. Vinogradov, Elements of Number Theory, pp. 220 ff. %p A036145 [ seq(primroot(ithprime(i))^j mod ithprime(i),j=0..100) ]; %o A036145 (PARI) a(n)=lift(Mod(3,137)^n) \\ _Charles R Greathouse IV_, Mar 22 2016 %K A036145 nonn,easy %O A036145 0,2 %A A036145 _N. J. A. Sloane_