Numbers k that divide 10^k + 5^k.

Terms

a(0) =1a(1) =3a(2) =5a(3) =9a(4) =15a(5) =25a(6) =27a(7) =45a(8) =55a(9) =75a(10) =81a(11) =125a(12) =135a(13) =165a(14) =171a(15) =225a(16) =243a(17) =275a(18) =375a(19) =405a(20) =495a(21) =513a(22) =605a(23) =625a(24) =675a(25) =729a(26) =825a(27) =855a(28) =1125a(29) =1215