9000000
domain: N
Appears in sequences
- Powers of 3 written in base 27.at n=20A004669
- Squares using no more than two distinct digits.at n=31A018885
- Numbers of form 9^i*10^j, with i, j >= 0.at n=34A025635
- Squares with digits in nonincreasing order.at n=29A028822
- Number of nonzero palindromes of length n.at n=12A050683
- Number of nonzero palindromes of length n.at n=13A050683
- First differences of 10^n (A011557).at n=6A052268
- Expansion of e.g.f. (1-x)/(1-5*x).at n=6A052675
- Squares such that each digit is a square and the sum of the digits is a square.at n=26A061270
- Squares such that (1) each digit is a square, (2) the sum of squares of the digits is a square.at n=14A061272
- Squares which produce squares when the leading digit is moved to the end.at n=23A061459
- Number of nonnegative integers with n digits.at n=6A063945
- Smallest n-digit square starting with 9, or 0 if no such number exists.at n=6A067479
- Numbers n such that n and its 10's complement are both squares, i.e., n and 10^k - n (where k is the number of digits in n) are squares.at n=26A068810
- Number of n-digit palindromes.at n=12A070252
- Number of n-digit palindromes.at n=13A070252
- Squares which leave a square at every step if most significant digit and least significant digit are deleted until a one-digit or two-digit square is obtained.at n=36A077487
- a(n) = (n(n+1)^(n-2)+0^(n-2))/(n+1).at n=7A085390
- Squares in which the neighboring digits differ at most by 1. Neighbors of 1 are 0 and 2, neighbors of 0 are 1 and 9.at n=16A087553
- Expansion of (1-5*x)/(1-10*x-100*x^2).at n=6A094364