Numbers k such that k^2 has only even digits.

Terms

a(0) =0a(1) =2a(2) =8a(3) =20a(4) =22a(5) =68a(6) =78a(7) =80a(8) =92a(9) =162a(10) =168a(11) =200a(12) =202a(13) =220a(14) =262a(15) =298a(16) =478a(17) =492a(18) =498a(19) =668a(20) =680a(21) =780a(22) =800a(23) =898a(24) =908a(25) =920a(26) =932a(27) =1422a(28) =1492a(29) =1498