Non-primitive words on {1,2,3}.

Terms

a(0) =11a(1) =22a(2) =33a(3) =111a(4) =222a(5) =333a(6) =1111a(7) =1212a(8) =1313a(9) =2121a(10) =2222a(11) =2323a(12) =3131a(13) =3232a(14) =3333a(15) =11111a(16) =22222a(17) =33333a(18) =111111a(19) =112112a(20) =113113a(21) =121121a(22) =121212a(23) =122122a(24) =123123a(25) =131131a(26) =131313a(27) =132132a(28) =133133a(29) =211211