Numbers k that divide s(k), where s(1)=1, s(j)=20*s(j-1)+j.

Terms

a(0) =1a(1) =2a(2) =4a(3) =5a(4) =6a(5) =10a(6) =12a(7) =14a(8) =18a(9) =19a(10) =20a(11) =28a(12) =30a(13) =36a(14) =38a(15) =42a(16) =54a(17) =55a(18) =60a(19) =70a(20) =76a(21) =84a(22) =90a(23) =95a(24) =98a(25) =108a(26) =110a(27) =114a(28) =126a(29) =140