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%I #12 Aug 25 2021 04:56:07
%S 1,5,5905,11855474405,101901244565,248518793938105,204587230614395065
%N Numbers k such that k^2 divides 9^k + 1.
%Y Cf. A062396.
%Y Subsequence of A015957.
%Y Cf. A127101 and A128682.
%K nonn,more
%O 1,2
%A _Max Alekseyev_, Sep 15 2017