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%I #7 Aug 26 2021 08:23:16
%S 1,7,203,11977,154553,353423,4482037,9904979,20851957,69262991,
%T 264440183,6824905927,7803226417,17244568439,47773414171,57280493557,
%U 120586867331,197922271883,218692031341,249815987281,409580786629,460390358603,802768833013,963574941161,1003238606531,1146808373599,1385429010959,1529257578289
%N Numbers k such that k^2 divides 13^k + 1.
%H Max Alekseyev, <a href="/A292338/b292338.txt">Table of n, a(n) for n = 1..51</a>
%Y Subsequence of A015963.
%Y Cf. A128393, A177813.
%K nonn
%O 1,2
%A _Max Alekseyev_, Sep 16 2017
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