30936

Appears in sequences

• Numbers n such that sigma(phi(n))-phi(n) = phi(sigma(n)-n).at n=11A132793
• Number of chiral pairs of polyominoes with n cells that have precisely the symmetry group of order 4 generated by 90-degree rotations.at n=39A144553
• Number of 3-step one or two space at a time bishop's tours on an n X n board summed over all starting positions.at n=25A187047
• Expansion of 1/(1 - x + x^2 - x^3 - x^6 - x^9 + x^10 - x^11 + x^12).at n=53A225499