Smallest multiple of n using only digits 0 and 7.

Terms

a(0) =7a(1) =70a(2) =777a(3) =700a(4) =70a(5) =7770a(6) =7a(7) =7000a(8) =777777777a(9) =70a(10) =77a(11) =77700a(12) =7007a(13) =70a(14) =7770a(15) =70000a(16) =77707a(17) =7777777770a(18) =77007a(19) =700a(20) =777a(21) =770a(22) =770707a(23) =777000a(24) =700a(25) =70070a(26) =7707777777a(27) =700a(28) =7707707a(29) =7770