Numbers n such that n is a substring of its square in base 7 (written in base 10).

Terms

a(0) =0a(1) =1a(2) =7a(3) =30a(4) =49a(5) =285a(6) =343a(7) =911a(8) =1900a(9) =2208a(10) =2401a(11) =13962a(12) =16807a(13) =59763a(14) =64098a(15) =69128a(16) =85880a(17) =97734a(18) =117649a(19) =195032a(20) =418341a(21) =754422a(22) =823543a(23) =2162126a(24) =2629229a(25) =2790841a(26) =3488518a(27) =3842400a(28) =4960401a(29) =5764801