Hint: ABOUT
1, 6 prime
1, 6 composite
1, 2, 3, 6 prime
1, 2, 3, 6 composite
1, 2, 3, 4, 6 prime
1, 2, 3, 4, 6 composite
3,,,,
218-->
121-->
252-->
10, 12, 14, , ,