This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A178201 #11 Mar 31 2012 10:22:16
%S A178201 1,3,19,37,6,7,17,11,92,31,15,29,794,21,26,215,22,23,98,49,124,19849,
%T A178201 42,12405874306277,284,75,1574,221,36,323,70,119,56,133,58,685,44,69,
%U A178201 142,187,41,31561,82,3197,148,10073,51,511,176,37603,62,437,86,1339,1546,63,386,12599,138,3017,140,493,1538,529,72,935,118,303,253,277061,95
%N A178201 Smallest k such that 40^k mod k = n.
%t A178201 aa = {}; Do[k = 1; While[PowerMod[40, k, k] != n, k++ ]; Print[{n, k}]; AppendTo[aa, k], {n, 1, 50}]; aa
%Y A178201 Cf. A036236, A078457, A119678, A119679, A119714, A119715, A119716, A127817-A127821, A128154-A128372, A178194-A178202
%K A178201 nonn
%O A178201 0,2
%A A178201 _Artur Jasinski_, May 23 2010
%E A178201 Terms a(23) onward from _Max Alekseyev_, Mar 19 2012