None of the digits in k is present in k^2 or k^3.

Terms

a(0) =2a(1) =3a(2) =7a(3) =8a(4) =22a(5) =47a(6) =53a(7) =77a(8) =92a(9) =157a(10) =187a(11) =188a(12) =192a(13) =552a(14) =558a(15) =577a(16) =707a(17) =772a(18) =922a(19) =2522a(20) =8338a(21) =17177a(22) =66888a(23) =575757a(24) =929522a(25) =1717177a(26) =8888588