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

Terms

a(0) =2a(1) =5a(2) =5a(3) =6a(4) =8a(5) =8a(6) =8a(7) =18a(8) =18a(9) =18a(10) =1652a(11) =2135a(12) =40332a(13) =40332a(14) =78740a(15) =80661a(16) =165389a(17) =165389a(18) =239008a(19) =686015a(20) =4260196a(21) =5018507a(22) =5018507a(23) =5018507a(24) =5018507a(25) =43624023a(26) =43624023a(27) =43624023a(28) =43624023a(29) =43624023