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%I #20 Jun 06 2021 06:27:40
%S 1,17,128583032925805678351
%N Numbers k such that k^2 divides 18^k - 1.
%C 17 divides a(n) for n > 1.
%Y Subsequence of A128358.
%Y Cf. A127103, A127104, A127105, A127106, A127107, A127102, A127101, A127100, A127092, A128405, A128393, A128394, A128395, A128396, A128397, A128398, A128399, A128400, A128401, A128402, A128403, A128404.
%K bref,hard,more,nonn
%O 1,2
%A _Alexander Adamchuk_, Mar 08 2007