Number of '3' digits 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, ...).

A277833

Number of '3' digits 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) =23a(4) =349a(5) =4721a(6) =59553a(7) =718985a(8) =8424417a(9) =96589849a(10) =1089355281a(11) =12128120713a(12) =133626886145

External references