a(n) is root of square starting with digit 9: first term of runs.

Terms

a(0) =30a(1) =95a(2) =300a(3) =949a(4) =3000a(5) =9487a(6) =30000a(7) =94869a(8) =300000a(9) =948684a(10) =3000000a(11) =9486833a(12) =30000000a(13) =94868330a(14) =300000000a(15) =948683299a(16) =3000000000a(17) =9486832981a(18) =30000000000a(19) =94868329806a(20) =300000000000a(21) =948683298051