221707200domain: NAppears in sequencesa(n) = (n/(n+1)) * lcm(1,2,...,n+1).at n=19A025558Smallest integer value of n!/(m_1!*m_2!*...*m_k!), where 1=m_1 < m_2 < ... is the sequence of integers coprime to n.at n=19A088303