Numbers k that divide s(k), where s(1)=1, s(j)=4*s(j-1)+j.

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =6a(5) =9a(6) =10a(7) =12a(8) =18a(9) =20a(10) =21a(11) =27a(12) =30a(13) =36a(14) =42a(15) =50a(16) =54a(17) =60a(18) =63a(19) =68a(20) =78a(21) =81a(22) =84a(23) =90a(24) =100a(25) =108a(26) =110a(27) =126a(28) =147a(29) =150