5021647domain: NAppears in sequencesNumbers n such that n = pi(n) + phi(n), where pi = A000720, phi = A000010.at n=13A037170Numbers n such that n is the phi(n)-th nonprime number.at n=12A100411Numbers n such that n = pi(n) + uphi(n), where pi = A000720, uphi = A047994.at n=18A298761