Squarefree numbers obtained by repeating a single digit.

Terms

a(0) =1a(1) =2a(2) =3a(3) =5a(4) =6a(5) =7a(6) =11a(7) =22a(8) =33a(9) =55a(10) =66a(11) =77a(12) =111a(13) =222a(14) =555a(15) =777a(16) =1111a(17) =2222a(18) =3333a(19) =5555a(20) =6666a(21) =7777a(22) =11111a(23) =22222a(24) =33333a(25) =55555a(26) =66666a(27) =77777a(28) =111111a(29) =222222