(10^n)-th digit of infinite string 12345678910111213141516...

Terms

a(0) =1a(1) =1a(2) =5a(3) =3a(4) =7a(5) =2a(6) =1a(7) =7a(8) =8a(9) =1a(10) =1a(11) =0a(12) =1a(13) =5a(14) =7a(15) =2a(16) =6a(17) =4a(18) =3a(19) =5a(20) =3a(21) =5a(22) =4a(23) =9a(24) =6a(25) =2a(26) =4a(27) =8a(28) =7a(29) =1