5999999

Appears in sequences

• Smallest number whose digits sum to n-th prime.at n=16A046864
• a(n) = n*10^n - 1.at n=5A064756
• a(n) is the smallest composite number with the sum of digits = the n-th prime number.at n=16A073868
• Positive integers a such that f(3a)+f(a)=concatenation of 3a and a, where f(k)=k(k+3)/2 (A000096).at n=6A099151
• Smallest semiprime containing exactly n 9's.at n=5A104775
• Smallest semiprime ending in exactly n 9's.at n=5A106663
• Smallest number whose sum of digits is 2n+1.at n=29A131668
• Least k such that n divides A045876(k).at n=58A276597
• A number N is called a "rebel" number if there do not exist two integers a and b such that N = a + b with a > b > 0 and S(a) = S(b) where S(n) is the sum of the digits of the number n.at n=47A292514