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Numbers k such that k^2 divides 9^k + 1.
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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