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Least number m such that 5^m == +- 1 (mod 5n + 1).
1

%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_