871425

Appears in sequences

• Triangle T(n,k) = 10^(n-1) -1 + k*floor(9*10^(n-1)/(n+1)), with 1 <= r <= n, read by rows.at n=20A093850
• a(n) = 10^(n-1) - 1 + n*floor(9*10^(n-1)/(n+1)).at n=5A093852