49999999

Appears in sequences

• Smallest number whose digits sum to n-th prime.at n=18A046864
• a(n) is the smallest composite number with the sum of digits = the n-th prime number.at n=18A073868
• Integer part of the arithmetic mean of all the distinct numbers formed by permuting the digits of concatenation of numbers from 1 to n.at n=7A078266
• 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=31A093850
• Numbers n such that n concatenated with n+1 is triangular.at n=29A094609
• a(n) is the least positive integer in base 10 containing n nines that is divisible by n.at n=6A112909
• Smallest number whose sum of digits is 2n+1.at n=33A131668
• Smallest number whose sum of digits is 3n+1.at n=22A133264
• Numbers that are the sum or product of two numbers, such that the sum and product have reversed digits.at n=18A166749
• Numbers n such that (n+n+1) divides the decimal concatenation [n, n+1].at n=15A173712
• a(n) = 5*10^n - 1.at n=7A198971
• Number of composites removed in each step in the Sieve of Eratosthenes for 10^8.at n=0A227797
• a(n) = 2^(n mod 2)*5*10^floor(n/2) - 1.at n=14A268099