443555domain: NAppears in sequencesa(n) = (n-1)*(n+2)*(n^2 + n + 2)/4.at n=35A168566Composite squarefree numbers that are multiples of the root mean square of their prime factors.at n=19A255356Composite squarefree numbers k = Product_{i} p_i such that k^2 is divisible by Sum_{i} p_i^2.at n=12A332738