99999

Appears in sequences

• a(n) = 10^n - 1.at n=5A002283
• Kaprekar numbers: positive numbers n such that n = q+r and n^2 = q*10^m+r, for some m >= 1, q >= 0 and 0 <= r < 10^m, with n != 10^a, a >= 1.at n=23A006886
• Repdigit numbers, or numbers whose digits are all equal.at n=45A010785
• Numbers > 9 with all digits the same.at n=35A014181
• Divisors of 99999.at n=11A027893
• Divisors of 9999999999.at n=23A027895
• Numbers k such that k*(k+2) is a palindrome.at n=20A028503
• Numbers k such that (k*(k+1)*(k+2)) / (k+(k+1)+(k+2)) is a palindrome.at n=19A032789
• a(n)^3 is smallest cube containing exactly n 9's.at n=8A048374
• Largest number whose square has n digits.at n=9A049416
• Smallest number whose sum of digits is n.at n=45A051885
• The full list of 5-Kaprekar numbers.at n=7A053396
• Another version of the Kaprekar numbers (A006886): n such that n = q+r and n^2 = q*10^m+r, for some m >= 1, q >= 0 and 0 <= r < 10^m, with n != 10^a, a >= 1 and n an m-digit number.at n=20A053816
• Largest number that has the same number of digits in base 10 and base n, or 0 if no such number exists.at n=15A055866
• Largest number that has the same number of digits in base 10 and base n, or 0 if no such number exists.at n=14A055866
• Trimorphic but not bimorphic nor automorphic.at n=37A056032
• Palindromes n such that n and n^2 have same digit sum.at n=28A058852
• a(n) is the smallest number k such that the letter "N" appears n times when k is written in English.at n=11A060227
• a(n) is the largest number which can be formed with no zeros, using least number of digits and having digit sum = n.at n=44A061219
• Largest number whose cube has n digits.at n=14A061439