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%I #9 Jun 11 2021 04:59:05
%S 1,2,4,6,8,12,16,18,20,24,36,40,42,48,60,72,78,80,84,116,120,126,144,
%T 156,168,180,220,232,234,240,252,312,336,342,348,360,420,440,464,468,
%U 504,546,580,624,660,684,696,720,780,840,880,936,1008,1044,1092,1160
%N Numbers k such that k^2 divides 17^k-1.
%C The first 9 numbers (and many more) which are a multiple of their digital sum in all bases from 2 through 16 (A218087), are members of this sequence, and also of A177917. - _M. F. Hasler_, Oct 22 2012
%o (PARI) is_A128397(n)=Mod(17,n^2)^n==1 \\ _M. F. Hasler_, Oct 22 2012
%Y Cf. A127103, A127104, A127105, A127106, A127107, A127102, A127101, A127100, A127092, A128405, A128393, A128394, A128395, A128396, A128398, A128399, A128400, A128401, A128402, A128403, A128404.
%Y Cf. A177917.
%K nonn,less
%O 1,2
%A _Alexander Adamchuk_, Mar 01 2007
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