300000000000
domain: N
Appears in sequences
- Powers of 3 written in base 9.at n=23A004663
- a(n) is root of square starting with digit 9: first term of runs.at n=20A035076
- Expansion of (1-7x)/(1-10x).at n=12A093138
- Length of the cycle for Lucas numbers mod 10^n.at n=11A114307
- a(n) is the minimal difference between two distinct n-digit numbers with property that when one of them is typed into a calculator and rotated 180 degrees, the other one is seen.at n=22A125521
- Numbers k such that k and k^2 use only the digits 0, 1, 3 and 9.at n=24A136853
- Numbers k such that k and k^2 use only the digits 0, 3, 5 and 9.at n=18A136942
- a(n) = the smallest number ending in n-1 zeros divisible by n.at n=11A173478
- a(n) = the smallest n-digit number ending in n-1 zeros that is divisible by n, else 0.at n=11A173479
- Numbers k such that k^2 contains exactly 2 distinct digits and k^3 contains exactly 3 distinct digits.at n=16A247047