%I #20 Mar 14 2015 17:43:09
%S 1,37,3,5,6,11,1438,31,9,29,18,45021,13,5249,22,23,20,69,25,437,21,
%T 227643018837677,42,141,50,19877,27,121,36,303,98,49,75,329,94,261,
%U 116,9200543,39,87541720241623,52,1119,1402,510025,356,24829,466,51
%N Smallest k such that 38^k mod k = n.
%t aa = {}; Do[k = 1; While[PowerMod[38, k, k] != n, k++ ]; Print[{n, k}]; AppendTo[aa, k], {n, 1, 50}]; aa
%t sk[n_]:=Module[{k=1},While[PowerMod[38,k,k]!=n,k++];k]; Array[sk,50,0] (* _Harvey P. Dale_, Mar 14 2015 *)
%Y Cf. A036236, A078457, A119678, A119679, A119714-A119716, A127817-A127821, A128154-A128372, A178194-A178202
%K nonn
%O 0,2
%A _Artur Jasinski_, May 23 2010
%E Terms a(21) onward from _Max Alekseyev_, Apr 22 2012