118470domain: NAppears in sequencesG.f.: exp( Sum_{n>=1} (x^n/n) / Product_{d|n} (1 - d*x^n)^d ).at n=20A205488Erroneous version of A339783.at n=6A220834Trajectory of 270 under repeated application of k -> (phi(k)+sigma(k))/2.at n=22A291789