45097domain: NAppears in sequencesNumbers k such that phi(k) and cototient(k) are squares but k is not in A054755.at n=20A054756a(n) = (n!)^2 * Sum_{k=0..n-1} 1 / ((n-k) * k!)^2.at n=6A346410Number of connected components of n faces of the snub dodecahedron up to the 60 rotations of the snub dodecahedron.at n=11A384112