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Numbers k that divide s(k), where s(1)=1, s(j)=13*s(j-1)+j.
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%I #16 Aug 08 2021 11:34:01

%S 1,3,9,13,27,39,81,117,183,243,351,549,689,729,1053,1647,2067,2187,

%T 2379,3081,3159,4941,6201,6561,7137,9243,9477,11163,14823,18603,19683,

%U 21411,27729,28431,33489,36517,42627,44469,55809,59049,64233,67161,73723,83187,85293

%N Numbers k that divide s(k), where s(1)=1, s(j)=13*s(j-1)+j.

%o (PARI) lista(nn) = my(s); for(k=1, nn, s=13*s+k; if(s%k==0, print1(k, ", "))); \\ _Jinyuan Wang_, Aug 08 2021

%Y s(n) = A014896(n).

%K nonn

%O 1,2

%A _N. J. A. Sloane_, _Olivier GĂ©rard_

%E More terms from _Jinyuan Wang_, Aug 08 2021