Numbers k such that k and k^2 use only the digits 0, 3, 4, 5 and 6.

Terms

a(0) =0a(1) =6a(2) =60a(3) =66a(4) =600a(5) =656a(6) =660a(7) =666a(8) =6000a(9) =6560a(10) =6600a(11) =6660a(12) =6666a(13) =60000a(14) =63566a(15) =65600a(16) =66000a(17) =66600a(18) =66660a(19) =66666a(20) =600000a(21) =603656a(22) =604434a(23) =635660a(24) =656000a(25) =660000a(26) =660656a(27) =666000a(28) =666600a(29) =666660