61931424domain: NAppears in sequencesa(n) = (Product k) * (Sum 1/k), where both the product and the sum are over those positive integers k, where k <= n and gcd(k,n) = 1.at n=23A056855Numerator of Sum_{1<=k<=n, gcd(k,n)=1} 1/k.at n=23A093600