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%I #24 Mar 30 2022 07:54:44
%S 71,13993643,19152352117,227633407,813955076015309926319,
%T 4098986195943739,46959719470144429555105032871,
%U 491873569944394295636860313807677,1848593595048531176470116001230356265643249547,108685909290746311448943506365699
%N The right Aurifeuillian factor of k^k - 1 for k congruent to 1 (mod 4) and squarefree.
%C The values of k 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>, arXiv:1004.5466 [math.NT], 2010.
%e 13993643 is in the sequence because it is an Aurifeuillian factor of 13^13-1.
%Y Cf. A005117, A220983, A220984, A230375-A230377, A230376.
%K nonn
%O 1,1
%A _Colin Barker_, Oct 17 2013