Largest number whose 4th power has n digits.

Terms

a(0) =1a(1) =3a(2) =5a(3) =9a(4) =17a(5) =31a(6) =56a(7) =99a(8) =177a(9) =316a(10) =562a(11) =999a(12) =1778a(13) =3162a(14) =5623a(15) =9999a(16) =17782a(17) =31622a(18) =56234a(19) =99999a(20) =177827a(21) =316227a(22) =562341a(23) =999999a(24) =1778279a(25) =3162277a(26) =5623413a(27) =9999999a(28) =17782794a(29) =31622776