549999

Appears in sequences

• Triangle read by rows: T(n, k) = 10^(n-1) - 1 + k*floor(9*10^(n-1)/n), for 1 <= k <= n.at n=17A093846
• Arithmetic mean of all n-digit positive even numbers.at n=5A110430
• Arithmetic mean of all n-digit positive multiples of n, rounded down.at n=5A110432