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 A271352 #14 Sep 08 2022 08:46:16 %S A271352 1,3,9,27,81,32,96,77,20,60,180,118,143,7,21,63,189,145,13,39,117,140, %T A271352 209,205,193,157,49,147,19,57,171,91,62,186,136,197,169,85,44,132,185, %U A271352 133,188,142,4,12,36,108,113,128,173,97,80,29,87,50,150 %N A271352 a(n) = 3^n mod 211. %H A271352 Vincenzo Librandi, <a href="/A271352/b271352.txt">Table of n, a(n) for n = 0..1000</a> %F A271352 a(n) = a(n-210). %t A271352 PowerMod[3, Range[0, 100], 211] %o A271352 (Magma) [Modexp(3, n, 211): n in [0..100]]; %o A271352 (PARI) a(n) = lift(Mod(3, 211)^n); \\ _Altug Alkan_, Apr 05 2016 %Y A271352 Cf. similar sequences listed in A271350. %K A271352 nonn,easy %O A271352 0,2 %A A271352 _Vincenzo Librandi_, Apr 05 2016