499999999

Appears in sequences

• Smallest number whose sum of digits is 3n+1.at n=25A133264
• Smallest number whose sum of digits is 2n.at n=38A133296
• Minimum number k for which the digital sum of k*n is 4*n.at n=20A147824
• Minimum number k for which the digital sum of k*n is 7*n.at n=12A147827
• Numbers that are the sum or product of two numbers, such that the sum and product have reversed digits.at n=20A166749
• Numbers n such that (n+n+1) divides the decimal concatenation [n, n+1].at n=17A173712
• a(n) = 5*10^n - 1.at n=8A198971
• Number of composites removed in each step of the Sieve of Eratosthenes for 10^9.at n=0A227798
• a(n) = 2^(n mod 2)*5*10^floor(n/2) - 1.at n=16A268099