Smallest multiple of n using only digits 0 and 5.

Terms

a(0) =5a(1) =50a(2) =555a(3) =500a(4) =5a(5) =5550a(6) =5005a(7) =5000a(8) =555555555a(9) =50a(10) =55a(11) =55500a(12) =5005a(13) =50050a(14) =555a(15) =50000a(16) =55505a(17) =5555555550a(18) =55005a(19) =500a(20) =50505a(21) =550a(22) =550505a(23) =555000a(24) =50a(25) =50050a(26) =5505555555a(27) =500500a(28) =5505505a(29) =5550