6666666667
domain: N
Appears in sequences
- a(n)^2 is smallest square starting with a string of n 4's.at n=9A034984
- Numbers k such that k^2 contains only digits {4,8,9}.at n=21A053966
- Number of Fibonacci numbers A000045(k), k <= 10^n, which end in 4.at n=11A067275
- Duplicate of A067275.at n=11A073552
- Numbers k with the property that k divides one of the concatenations (k-1)(k-2) or (k-2)(k-1).at n=39A077292
- Numbers n > 2 such that n divides the concatenation of n-2 and n-1.at n=12A088797
- 3-automorphic numbers: positive integers k such that 3k^2 ends with k.at n=26A383821