Numbers k such that k^2 contains exactly 2 distinct digits.

Terms

a(0) =4a(1) =5a(2) =6a(3) =7a(4) =8a(5) =9a(6) =10a(7) =11a(8) =12a(9) =15a(10) =20a(11) =21a(12) =22a(13) =26a(14) =30a(15) =38a(16) =88a(17) =100a(18) =109a(19) =173a(20) =200a(21) =212a(22) =235a(23) =264a(24) =300a(25) =1000a(26) =2000a(27) =3000a(28) =3114a(29) =10000