%I #10 Oct 22 2023 16:45:59
%S 1,5,4,3,2,3,6,10,11,16,6,15,10,5,9,27,21,12,8,25,26,36,14,55,3,65,16,
%T 23,36,75,4,33,41,18,20,15,6,19,42,11,51,35,18,16,56,30,29,20,20,25,
%U 64,21,18,27,22,70,20,96,36,21,48,155,39,53,27,165,12,15
%N Least number m such that 5^m == +- 1 (mod 5n + 1).
%K nonn
%O 1,2
%A _N. J. A. Sloane_