76680

Appears in sequences

• Number of 7 X 7 arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to n.at n=37A156392
• Number of n X n arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to 37.at n=5A156501
• Numbers n such that n = concatenate(a, b) and sigma(a) + sigma(b) = phi(n).at n=9A249065
• Number of irredundant sets in the n-crown graph.at n=12A290710
• Dirichlet g.f.: Product_{k>=2} (1 + k^(-s))^(k^3).at n=23A343323