Numbers k such that k and k^2 use only the digits 2, 4, 6, 8 and 9.

Terms

a(0) =2a(1) =8a(2) =22a(3) =68a(4) =92a(5) =222a(6) =262a(7) =264a(8) =288a(9) =668a(10) =964a(11) =6668a(12) =6962a(13) =9288a(14) =9842a(15) =26262a(16) =49462a(17) =49692a(18) =49842a(19) =66668a(20) =69462a(21) =82864a(22) =99462a(23) =99842a(24) =494262a(25) =494462a(26) =499462a(27) =649842a(28) =666668a(29) =684462