451508436992domain: NAppears in sequencesNumbers of the form p^q * q^p, with distinct primes p and q.at n=13A082949Numbers of the form p^2 * 2^p for p prime.at n=9A098096Numbers whose prime factors are raised to the powers of each other.at n=15A113855Integers of the form 2^p*p^2 where p is the lesser of a pair of twin primes.at n=4A240983