99999999999
domain: N
Appears in sequences
- a(n) = 10^n - 1.at n=11A002283
- Divisors of 10^11 - 1.at n=11A027896
- Palindromic Super-9 Numbers.at n=3A032757
- Largest number whose square has n digits.at n=21A049416
- a(n) is the smallest number k such that the letter "N" appears n times when k is written in English.at n=27A060227
- a(n) = n*10^n - 1.at n=9A064756
- Worthless numbers: numbers without h, o, r, t, or w.at n=25A073419
- Palindromes k such that k + 2 is also a palindrome.at n=17A082274
- Palindromes arising in A083457.at n=10A083461
- a(n) = (n-1)^n - 1.at n=11A085606
- a(n) = 10^n + (-1)^n.at n=11A098610
- a(n) = 0^n + 10^n - 1.at n=11A103456
- Largest n-digit number coprime to n.at n=10A108908
- n times n+4 gives the concatenation of two numbers m and m-4.at n=17A116260
- Repdigit Kaprekar numbers.at n=18A145875
- a(10n+m) is the integer with n+m concatenations of the digit m in base 10, 0<=m<=9.at n=28A158849
- a(n) = denominator of fraction a/b, where gcd(a, b) = 1, whose decimal representation has the form 0.(1)(2)(3)...(n-1)(n)... with period (1)(2)(3)...(n-1)(n).at n=9A172498
- Next smallest n such that digit sum of n >= previous term.at n=11A180084
- a(n) = the largest n-digit number with exactly 12 divisors, a(n) = 0 if no such number exists.at n=10A182684
- Repdigit numbers with repdigit digital sum.at n=32A201061