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a(n) = 9^n mod n.
7

%I #14 Dec 07 2024 13:40:31

%S 0,1,0,1,4,3,2,1,0,1,9,9,9,11,9,1,9,9,9,1,15,15,9,9,24,3,0,9,9,21,9,1,

%T 3,13,4,9,9,5,27,1,9,15,9,5,9,35,9,33,30,1,15,9,9,27,34,25,45,23,9,21,

%U 9,19,36,1,29,9,9,33,39,51,9,9,9,7,24,25,4,27,9,1

%N a(n) = 9^n mod n.

%H Harry J. Smith, <a href="/A066440/b066440.txt">Table of n, a(n) for n = 1..1000</a>

%p seq(irem(9^n,n),n=1..80); # _Zerinvary Lajos_, Apr 20 2008

%t Table[PowerMod[9, n, n], {n, 80} ]

%o (PARI) a(n) = { lift(Mod(9, n)^n) } \\ _Harry J. Smith_, Feb 14 2010

%K nonn

%O 1,5

%A _Robert G. Wilson v_, Dec 27 2001