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%I #9 Oct 22 2023 16:59:57
%S 1,11,8,6,6,33,12,11,10,3,2,3,12,30,41,29,23,11,6,48,28,81,63,26,11,
%T 120,74,51,16,165,6,44,12,50,32,99,16,209,7,42,56,231,78,48,60,156,6,
%U 253,18,84,140,19,72,48,100,154,78,105,60,33,24,341,173,46,89
%N Least number m such that 11^m == +- 1 (mod 11n + 1).
%K nonn
%O 1,2
%A _N. J. A. Sloane_