67647domain: NAppears in sequencesCOMPOSE natural numbers with primes.at n=7A030281Expansion of Sum_{n>=1} q^(n*(n-1)) / (1-q)^n.at n=47A321481Numbers k such that k![4] - 512 is prime, where k![4] = A007662(k) = quadruple factorial.at n=34A329183