Number of digits '9' in the set of all numbers from 0 to A014824(n) = sum_{i=1..n} i*10^(n-i) = (0, 1, 12, 123, 1234, 12345, ...).
A277849
Number of digits '9' in the set of all numbers from 0 to A014824(n) = sum_{i=1..n} i*10^(n-i) = (0, 1, 12, 123, 1234, 12345, ...).
Terms
- a(0) =0a(1) =0a(2) =1a(3) =22a(4) =343a(5) =4664a(6) =58985a(7) =713306a(8) =8367627a(9) =96021949a(10) =1083676281a(11) =12071330713a(12) =133058986145
External references
- oeis: A277849