Numbers k that divide 7^k + 3^k.

Terms

a(0) =1a(1) =2a(2) =5a(3) =25a(4) =55a(5) =58a(6) =125a(7) =155a(8) =275a(9) =605a(10) =625a(11) =775a(12) =1265a(13) =1375a(14) =1682a(15) =1705a(16) =3025a(17) =3125a(18) =3875a(19) =4805a(20) =6325a(21) =6655a(22) =6875a(23) =8525a(24) =13915a(25) =15125a(26) =15625a(27) =18755a(28) =19375a(29) =24025