%I #10 Oct 22 2023 16:46:10
%S 1,9,3,9,11,10,8,3,2,3,10,27,29,63,8,7,15,81,21,45,18,99,6,15,28,46,5,
%T 55,65,15,6,68,37,17,39,30,83,147,20,171,18,189,24,99,42,82,26,27,24,
%U 20,22,33,119,243,30,25,64,29,9,135,10,21,35,12,73,24,25
%N Least number m such that 9^m == +- 1 (mod 9n + 1).
%K nonn
%O 1,2
%A _N. J. A. Sloane_
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