Numbers k such that k and k^2 use only the digits 1, 2, 3, 5 and 6.

Terms

a(0) =1a(1) =5a(2) =6a(3) =11a(4) =15a(5) =16a(6) =25a(7) =35a(8) =56a(9) =111a(10) =115a(11) =125a(12) =231a(13) =235a(14) =256a(15) =335a(16) =365a(17) =511a(18) =515a(19) =516a(20) =1125a(21) =1156a(22) =1231a(23) =1235a(24) =1525a(25) =1535a(26) =2261a(27) =2515a(28) =2556a(29) =3335