64647

Appears in sequences

• Number of 0..6 arrays of length n with each element unequal to at least one neighbor, with new values introduced in 0..6 order.at n=9A221457
• Odd numbers n containing 65536 as the highest power of 2 in their Collatz (3x+1) iteration.at n=16A247716
• a(n) = Sum_{1 <= x_1, x_2, x_3 <= n} gcd(x_1, x_2, n)/gcd(x_1, x_2, x_3, n).at n=37A373061