31666

Appears in sequences

• Denominators of continued fraction convergents to sqrt(558).at n=14A042069
• a(n) = a(1) + a(2) + ... + a(n-1) - a(m) for n >= 4, where m = n - 1 - 2^p and p is the unique integer such that 2^p < n - 1 <= 2^(p+1), starting with a(1) = a(2) = 1 and a(3) = 3.at n=16A049894
• Least m such that reverse(sigma(m)) = sigma(m+n).at n=39A071813
• a(n) = A077706(n+1)/A077706(n).at n=16A077707
• Number of ways to place zero or more nonadjacent 1,1 2,1 2,2 3,0 3,1 4,2 polyhexes in any orientation on a planar nXnXn triangular grid.at n=6A155262