307874

Appears in sequences

• Numbers k such that sigma(sigma(k) - k) = phi(sigma(k) + k).at n=36A074886
• Number of permutations of 0..floor((n*9-2)/2) on odd squares of an nX9 array such that each row, column, diagonal and (downwards) antidiagonal of odd squares is increasing.at n=4A215869
• Number of permutations of 0..floor((5*n-2)/2) on odd squares of an 5Xn array such that each row, column, diagonal and (downwards) antidiagonal of odd squares is increasing.at n=8A215873