Treated as strings, n begins with Floor(sqrt(n)).

Terms

a(0) =1a(1) =80a(2) =90a(3) =91a(4) =92a(5) =93a(6) =94a(7) =95a(8) =96a(9) =97a(10) =98a(11) =99a(12) =100a(13) =101a(14) =102a(15) =103a(16) =104a(17) =105a(18) =106a(19) =107a(20) =108a(21) =109a(22) =9800a(23) =9900a(24) =9901a(25) =9902a(26) =9903a(27) =9904a(28) =9905a(29) =9906