Numbers k that divide 10^k + 3^k.

Terms

a(0) =1a(1) =13a(2) =169a(3) =1703a(4) =2197a(5) =22139a(6) =28561a(7) =76739a(8) =223093a(9) =287807a(10) =371293a(11) =447889a(12) =994747a(13) =997607a(14) =2399293a(15) =2900209a(16) =3741491a(17) =4826809a(18) =5802121a(19) =5822557a(20) =10052809a(21) =12931711a(22) =12968891a(23) =29225183a(24) =31190809a(25) =37702717a(26) =48639383a(27) =58673459a(28) =62748517a(29) =75427573