8494657921domain: NAppears in sequencesNumbers k such that gcd(phi(k), k-1) > lambda(k)^2.at n=3A283872Numbers n with record number of primes p such that n*p is a Carmichael number.at n=12A292366Carmichael numbers c with record number of primes p such that c*p is also a Carmichael number.at n=9A292367