555616domain: NAppears in sequencesPrimitive weird numbers: weird numbers with no proper weird divisors.at n=21A002975Primitive weird numbers of the form 2^k*p*q with k > 0 and where p < q are odd primes.at n=12A258882Least primitive weird number, pwn, (A002975) which is divisible by the n-th prime (A000040).at n=22A265727