481140domain: NAppears in sequencesa(n) = gcd(Phi(n!), Phi(n^n), Phi(lcm(1..n))).at n=32A064449Least positive integer k such that both k and k*n belong to the set {m>0: m+1, m^2+1 and m^2+prime(m)^2 are all prime}.at n=22A261339Expansion of e.g.f. exp(4*(exp(x) - 1) - 2*x).at n=8A367920