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Final 2 digits of 6^n.
4

%I #22 Sep 08 2022 08:44:29

%S 1,6,36,16,96,76,56,36,16,96,76,56,36,16,96,76,56,36,16,96,76,56,36,

%T 16,96,76,56,36,16,96,76,56,36,16,96,76,56,36,16,96,76,56,36,16,96,76,

%U 56,36,16,96,76,56,36,16,96

%N Final 2 digits of 6^n.

%C The period is 5.

%H Vincenzo Librandi, <a href="/A001311/b001311.txt">Table of n, a(n) for n = 0..1000</a>

%H <a href="/index/Fi#final">Index entries for sequences related to final digits of numbers</a>

%H INRIA Algorithms Project, <a href="http://ecs.inria.fr/services/structure?nbr=202">Encyclopedia of Combinatorial Structures 202</a>

%t PowerMod[6, Range[0, 60], 100] (* _Vincenzo Librandi_, Aug 15 2016 *)

%o (PARI) a(n)=lift(Mod(6,100)^n) \\ _Charles R Greathouse IV_, Dec 28 2012

%o (Magma) [Modexp(6, n, 100): n in [0..110]]; // _Vincenzo Librandi_, Aug 15 2016

%K nonn,easy

%O 0,2

%A _N. J. A. Sloane_