69999999

Appears in sequences

• Numbers n such that Sum_{k=1..n} d(k) is an integer where d(k) is the decimal fraction 0.k (e.g. d(999)=0.999).at n=14A054464
• a(n) = n*10^n - 1.at n=6A064756
• 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=33A093850
• Smallest number whose sum of digits is 2n+1.at n=34A131668
• Smallest number whose sum of digits is 3n.at n=23A133195
• a(n) = 7*10^n - 1.at n=7A198699
• Partial sums of A278742.at n=32A280730