99099

Appears in sequences

• Numbers having four 9's in base 10.at n=18A043528
• Palindromes n such that n and n^2 have same digit sum.at n=26A058852
• a(1) = 9, a(n+1) = smallest multiple of a(n) using only composite digits (4,6,8,9,0) and is not divisible by 10.at n=3A078238
• Pi*denominators of odd raw moments in the distribution of line lengths for lines picked at random in the unit disk.at n=4A093529
• Numbers whose set of base 10 digits is {0,9}.at n=27A097256
• Dimensions of certain Lie algebra (see reference for precise definition).at n=6A133355
• The larger companion to the deficient numbers in A212608.at n=29A212609
• Palindromes greater than 10 whose sum of proper divisors is also a palindrome greater than 10.at n=14A227228
• Each term is a palindrome such that the sum of its proper divisors is a palindrome > 1.at n=18A227947
• Palindromic numbers such that the sum of the digits equals the number of divisors.at n=30A263720
• a(n) = 10^(2n+1) - 1 - 9*10^n.at n=2A332190