1685448domain: NAppears in sequencesa(n) = n^2 * (n+1)^3.at n=17A099762Powerful numbers (definition 1) sandwiched between twin primes.at n=33A113839a(n) = Product_{d|n} lcm(d, sigma(d)) where sigma(k) is the sum of divisors of k (A000203).at n=33A334805