536481792000domain: NAppears in sequencesa(n) is the product of the positive integers each of which is <= n and is divisible by exactly one prime dividing n (but is coprime to every other prime dividing n). (a(1) = 1).at n=23A119794a(n) = product of numbers k < n such that 1 < gcd(k,n) and rad(k) != rad(n).at n=23A381674