Least positive multiple of n that when written in base 10 uses only 0's and 1's.

Terms

a(0) =1a(1) =10a(2) =111a(3) =100a(4) =10a(5) =1110a(6) =1001a(7) =1000a(8) =111111111a(9) =10a(10) =11a(11) =11100a(12) =1001a(13) =10010a(14) =1110a(15) =10000a(16) =11101a(17) =1111111110a(18) =11001a(19) =100a(20) =10101a(21) =110a(22) =110101a(23) =111000a(24) =100a(25) =10010a(26) =1101111111a(27) =100100a(28) =1101101a(29) =1110