97767domain: NAppears in sequencesNumbers n such that sum of divisors, sigma(n), and sum of the proper divisors, sigma(n)-n, are both square.at n=11A176996Number of regular tetrahedra in an n-node-per-edge tetrahedral grid.at n=29A269747Numbers whose sum of prime divisors equals the sum of square divisors.at n=30A390397