Least nonsquare whose square root starts with just n even decimal digits.

Terms

a(0) =2a(1) =17a(2) =5a(3) =6a(4) =37a(5) =65a(6) =8a(7) =689a(8) =1817a(9) =18a(10) =1652a(11) =2135a(12) =40886a(13) =40332a(14) =78740a(15) =80661a(16) =214227a(17) =165389a(18) =239008a(19) =686015a(20) =4260196a(21) =5035566a(22) =21402156a(23) =7955040a(24) =5018507a(25) =408380425a(26) =400339626a(27) =514413258a(28) =1767402369a(29) =43624023