666668

Appears in sequences

• Numbers k such that k^2 contains only digits {2,4,6}.at n=11A053922
• Number of Fibonacci numbers F(k), k <= 10^n, which end in 8.at n=6A073555
• Numbers k such that k and k^2 use only the digits 1, 2, 4, 6 and 8.at n=38A136994
• Numbers k such that k and k^2 use only the digits 2, 3, 4, 6 and 8.at n=21A137072
• Numbers k such that k and k^2 use only the digits 2, 4, 5, 6 and 8.at n=32A137095
• Numbers k such that k and k^2 use only the digits 2, 4, 6, 7 and 8.at n=34A137101
• Numbers k such that k and k^2 use only the digits 2, 4, 6 and 8.at n=8A137103
• Numbers k such that k and k^2 use only the digits 2, 4, 6, 8 and 9.at n=28A137104
• For k in {2,3,...,9} define a sequence as follows: a(0)=0; for n>=0, a(n+1)=a(n)+1, unless a(n) ends in k, in which case a(n+1) is obtained by replacing the last digit of a(n) with the digit(s) of k^2. This is k(8).at n=33A237345
• Numbers k such that k + phi(k) is a power of 10.at n=5A244440