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%I #10 Jun 06 2021 06:03:15
%S 1,13,2041,24355253,249302027,16772956369,39665616523,388885239223,
%T 2974921088191,3487599163841,61054982558011,200151688351277,
%U 473329801968959
%N Numbers k such that k^2 divides 14^k - 1.
%C 13 divides all except the first term.
%Y Cf. A127103, A127104, A127105, A127106, A127107, A127102, A127101, A127100, A127092, A128405, A128393, A128395, A128396, A128397, A128398, A128399, A128400, A128401, A128402, A128403, A128404.
%K more,nonn,less
%O 1,2
%A _Alexander Adamchuk_, Mar 01 2007
%E a(4)-a(5) from _Farideh Firoozbakht_, Mar 05 2007
%E a(6)-a(13) from _Max Alekseyev_, May 06 2010
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