4579461601domain: NAppears in sequencesNumbers k such that gcd(phi(k), k-1) > lambda(k)^2.at n=2A283872Carmichael numbers k such that (k-1)/lambda(k) > (m-1)/lambda(m) for all Carmichael numbers m < k, where lambda is the Carmichael lambda function (A002322).at n=24A367320