89999999

Properties

Appears in sequences

• Primes that contain digits 8 and 9 only.at n=28A020472
• Smallest number whose digits sum to n-th prime.at n=19A046864
• Smallest prime number whose digits sum to n-th prime.at n=19A054750
• Smallest n-digit prime with maximum digit sum.at n=7A069661
• Smallest prime (> n-th prime) with sum of digits = the n-th prime, or 0 if no such prime exists.at n=19A075360
• Largest n-digit prime beginning with n.at n=6A077508
• Largest n-digit squarefree number beginning with n.at n=7A077514
• Primes of the form identical digits preceded by an 8.at n=7A090156
• 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=35A093850
• a(n) = 10^(n-1) - 1 + n*floor(9*10^(n-1)/(n+1)).at n=7A093852
• Primes of the form 9*10^k - 1.at n=2A093948
• Primes such that the outer 2 digits are n and n+1 and all inner digits are 9, where 0 < n < 9.at n=6A108828
• Maximal difference between two n-digit numbers.at n=7A109002
• Smallest number whose sum of digits is 2n+1.at n=35A131668
• Primes consisting of a digit and a nonempty string of 9's (i.e., primes of the form k*10^m - 1, where k is any digit).at n=23A141311
• Primes p such that p^s ends with p, where s is sum of the digits of p.at n=22A171267
• Near-repdigit primes with only digits 9 and a single 8 in decimal expansion.at n=6A263431
• Prime numbersat n=5216954