29160000domain: NAppears in sequencesa(n)=Product{k=0..n, 1+2^A101650(k)}/2.at n=16A101657Powers k^m, m > 1, where k is an Achilles number whose squarefree kernel is a primorial.at n=20A389226Powers k^m, m > 1, where k is an Achilles number that is a product of primorials.at n=12A389260