Numbers k that divide 7^k + 5^k.

Terms

a(0) =1a(1) =2a(2) =3a(3) =9a(4) =27a(5) =39a(6) =74a(7) =81a(8) =117a(9) =243a(10) =351a(11) =507a(12) =729a(13) =1053a(14) =1521a(15) =2187a(16) =2738a(17) =3081a(18) =3159a(19) =4563a(20) =6123a(21) =6561a(22) =6591a(23) =9243a(24) =9477a(25) =12207a(26) =13689a(27) =18369a(28) =19683a(29) =19773