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%I #5 Aug 26 2019 13:21:37
%S 0,3,1,23,97,423,2961,4343,63169,245575,408305,1809559,84001,50919655,
%T 155110993,548906039,2768600449,15085235847,36877174193,258140219351,
%U 707469907681,2753266098215,10476769665297,20560829523831,73557062489153,233424460713415
%N 7^n mod 4^n.
%t Table[PowerMod[7,n,4^n],{n,0,30}] (* _Harvey P. Dale_, Aug 26 2019 *)
%K nonn
%O 0,2
%A _N. J. A. Sloane_, May 20 2008
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