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%I #10 Jul 03 2021 16:22:33
%S 1,3,5,7,15,21,25,35,75,105,125,175,301,375,525,625,875,903,1389,1505,
%T 1875,2625,3125,3165,4375,4417,4515,6945,7525,9375,9723,11325,12943,
%U 13125,13251,15625,15825,21875,22085,22155,22575,23233,31375
%N Numbers k that divide s(k), where s(1)=1, s(j)=21*s(j-1)+j.
%K nonn
%O 1,2
%A _N. J. A. Sloane_, _Olivier Gérard_
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