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Numbers k such that k^2 divides 8^k + 1.
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%I #9 Aug 26 2021 03:26:07

%S 1,3,9,57,171,32547,97641,784899,9961491,14913081,24738057,29884473,

%T 250537059,297381939,892145817,1338104811,4014314433,5688011361,

%U 8515369251,8920514307,9146532873,14125430547,17064034083,26761542921,27439598619,143056660689,243640690617,730922071851,2157430689027,2606254774803,4323297055491,5222670270483

%N Numbers k such that k^2 divides 8^k + 1.

%Y Cf. A062395. Subsequence of A015955.

%Y Cf. A127102, A128681.

%K nonn

%O 1,2

%A _Max Alekseyev_, Sep 14 2017