Squarefree numbers containing in their decimal representation only the digits 0 and 1.

Terms

a(0) =1a(1) =10a(2) =11a(3) =101a(4) =110a(5) =111a(6) =1001a(7) =1010a(8) =1011a(9) =1101a(10) =1110a(11) =1111a(12) =10001a(13) =10010a(14) =10011a(15) =10101a(16) =10110a(17) =10111a(18) =11001a(19) =11010a(20) =11101a(21) =11110a(22) =11111a(23) =100001a(24) =100010a(25) =100011a(26) =100101a(27) =100110a(28) =100111a(29) =101001