21584305domain: NAppears in sequencesSmallest number k such that gcd(phi(k), k-1) = n * lambda(k).at n=6A284089Carmichael numbers m such that A309132(m) < m.at n=20A309268Carmichael numbers k for which A053575(k) [the odd part of phi] divides k-1.at n=19A339869Carmichael numbers ending in 5.at n=19A355305