99799

Appears in sequences

• Numbers having four 9's in base 10.at n=25A043528
• Largest palindrome using minimum number of digits with a digit sum = n.at n=43A070244
• a(n) = smallest multiple of 7 with a digit sum = n.at n=41A077493
• Expansion of g.f.: (1+x-sqrt(1-2*x-7*x^2-8*x^3-4*x^4))/(2*(1+x+x^2)).at n=11A108630
• a(n) is the smallest k different from n such that (n, k) is a Harshad amicable pair (see the comments).at n=42A272479
• a(n) = 10^(2n+1) - 1 - 2*10^n.at n=2A332197
• 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=42A344487