90000000000
domain: N
Appears in sequences
- Number of nonzero palindromes of length n.at n=20A050683
- Number of nonzero palindromes of length n.at n=21A050683
- First differences of 10^n (A011557).at n=10A052268
- Squares such that (1) each digit is a square, (2) the sum of squares of the digits is a square.at n=25A061272
- Number of nonnegative integers with n digits.at n=10A063945
- Smallest n-digit square starting with 9, or 0 if no such number exists.at n=10A067479
- Number of n-digit palindromes.at n=20A070252
- Number of n-digit palindromes.at n=21A070252
- a(n) = n^n * (n-1).at n=9A089205
- Total number of digits in all n-digit nonnegative integers.at n=9A113119
- Numbers n such that the sum of all numbers formed by deleting one digit from n is equal to n.at n=40A131639
- Squares that remain squares when prefixed with a 4.at n=21A167038
- a(n) = the largest n-digit number ending in n-1 zeros that is divisible by n, else 0.at n=9A173480
- a(n) = the largest (n+1)-digit number ending in n zeros that is divisible by n, else 0.at n=9A173483
- a(n) = the smallest number ending in n+1 zeros divisible by n.at n=8A173484
- a(n) = the smallest (n+2)-digit number ending in n+1 zeros that is divisible by n, else 0.at n=8A173485
- a(n) = the largest (n+2)-digit number ending in n+1 zeros that is divisible by n, else 0.at n=8A173486
- a(n) = 9*n*10^(n-1).at n=9A212704
- Number of n-digit numbers N such that the number formed by some nontrivial permutation of the digits of N divides N.at n=10A222812
- Squares which have one or more occurrences of exactly two different digits.at n=35A235717