%I A127820
%S A127820 11,5,15,10,7,21,25,34,549,134,120593747,13,20395,26,1713,20,203,57,49,
%T A127820 62,1707,122,55,30,793,118,45,58,1921,38,1853,56,339,110,4223,42,85,106,
%U A127820 1689,52,841,642,4475,70,51,551,11683,147,168061,94,129,623,1243895,90
%N A127820 a(n) = least k such that the remainder when 12^k is divided by k is n.
%H A127820 Robert G. Wilson v, <a href="a127820.txt">Table of n, a(n) for n = 1..10000 
               with -1 for large entries where a(n) has not yet been found</a>
%t A127820 t = Table[0, {10000} ]; k = 1; While[ k < 3000000000, a = PowerMod[12, 
               k, k]; If[a < 1001 && t[[a]] == 0, t[[a]] = k; Print[{a, k}]]; k++ 
               ]; t - Robert G. Wilson v (rgwv(at)rgwv.com), Aug 04 2009
%Y A127820 Cf. A036236, A078457, A119678, A119679, A127816, A119715, A119714, A127817, 
               A127818, A127819, A127821.
%Y A127820 Sequence in context: A131029 A033331 A085716 this_sequence A120831 A038319 
               A002547
%Y A127820 Adjacent sequences: A127817 A127818 A127819 this_sequence A127821 A127822 
               A127823
%K A127820 nonn
%O A127820 1,1
%A A127820 Alexander Adamchuk (alex(AT)kolmogorov.com), Jan 30 2007
%E A127820 More terms from Robert G. Wilson v (rgwv(at)rgwv.com), Feb 06 2007