12 = 2*2*3
42 =2*3*7
216 =2*2*2*3*3*3
450 =2*3*3*5*5
920= 2*2*2*5*23
2280= 2*2*2*3*5*19
10850=2*5*5*7*31
12 = 2*2*3
42 =2*3*7
216 =2*2*2*3*3*3
450 =2*3*3*5*5
920= 2*2*2*5*23
2280= 2*2*2*3*5*19
10850=2*5*5*7*31