%I
%S 11,1803647,2699538733,30778903,112663560435723374699,554945667652531,
%T 6243610407478181159725577611,67643278270835231300426724641533,
%U 253382315888712050791030544452181354268272663,14710826638296122001733445931451
%N The left Aurifeuillian factor of n^n  1 for n congruent to 1 mod 4 and squarefree.
%C The values of n are given by A005117, except for the leading 1.
%H Richard P. Brent, <a href="http://arxiv.org/abs/1004.5466">On computing factors of cyclotomic polynomials</a>
%e 1803647 is in the sequence because it is an Aurifeuillian factor of 13^131.
%Y Cf. A005117, A220983, A220984, A230375, A230377A230379.
%K nonn
%O 1,1
%A _Colin Barker_, Oct 17 2013
