9999999
domain: N
Appears in sequences
- a(n) = 10^n - 1.at n=7A002283
- Divisors of 9999999.at n=11A027891
- Numbers k such that k*(k+2) is a palindrome.at n=31A028503
- Numbers k such that (k*(k+1)*(k+2)) / (k+(k+1)+(k+2)) is a palindrome.at n=30A032789
- a(n)^3 is smallest cube containing exactly n 9's.at n=12A048374
- Largest number whose square has n digits.at n=13A049416
- Largest number that has the same number of digits in base 10 and base n, or 0 if no such number exists.at n=12A055866
- a(n) is the smallest number k such that the letter "N" appears n times when k is written in English.at n=17A060227
- Largest number whose cube has n digits.at n=20A061439
- Numbers k such that k * (digit complement of k) is a square.at n=19A069000
- Worthless numbers: numbers without h, o, r, t, or w.at n=16A073419
- a(n) is the smallest composite number with the sum of digits = the n-th composite number.at n=43A073866
- Nonsquarefree numbers obtained by repeating a single digit.at n=25A077572
- Palindromes k such that k + 2 is also a palindrome.at n=13A082274
- Palindromes arising in A083457.at n=6A083461
- Palindromes n such that 6n + 1 is also a palindrome.at n=21A083835
- a(n) = A084006(n)^(1/2).at n=19A084007
- Terms of A088753 that are not terms of A063048.at n=10A089521
- a(n) = 10^n + (-1)^n.at n=7A098610
- a(n) = 0^n + 10^n - 1.at n=7A103456