7999999

Appears in sequences

• Smallest number whose digits sum to n-th prime.at n=17A046864
• a(n) is the smallest composite number with the sum of digits = the n-th prime number.at n=17A073868
• Largest n-digit squarefree number beginning with n.at n=6A077514
• Smallest number whose sum of digits is 2n+1.at n=30A131668
• Smallest number whose sum of digits is 3n+1.at n=20A133264
• a(n) = 8*10^n - 1.at n=6A198973
• a(n) is the smallest k different from n such that (n, k) is a Harshad amicable pair (see the comments).at n=60A272479
• Partial sums of A278742.at n=28A280730
• 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=48A292514
• a(n) is the least k such that n is divisible by the sum of digits of k and k is divisible by the sum of digits of n; a(n) = -1 if no such k exists.at n=60A344487