4150656721domain: NAppears in sequencesPrimes of the form k!7+1, where k!7 is the septuple factorial number (A114799).at n=16A288717a(n) = n! * Sum_{d|n} d^n / (n/d)!.at n=6A354892a(n) = n! * Sum_{d|n} d^d / (n/d)!.at n=6A354900a(n) = n! * Sum_{d|n} (-1)^(d+1) * (n/d)^n / d!.at n=6A363698