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%I #11 Sep 08 2022 08:45:33
%S 0,4,6,104,311,2799,191,17344,77971,701739,456276,33403359,202973981,
%T 361922079,815892461,19550063399,145432992466,88193807194,
%U 1556683717871,10195456195214,34538646772551,120112957671709,2034690935451631,1622917881955304,50369047802832111
%N a(n) = 9^n mod 5^n.
%H Vincenzo Librandi, <a href="/A139730/b139730.txt">Table of n, a(n) for n = 0..1000</a>
%t Table[PowerMod[9,n,5^n],{n,0,30}] (* _Harvey P. Dale_, Jul 17 2021 *)
%o (Magma) [9^n mod 5^n: n in [0..35]]; // _Vincenzo Librandi_, Jun 03 2011
%K nonn
%O 0,2
%A _N. J. A. Sloane_, May 20 2008
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