11 and 13.
3 x 13 = 39
7 x 7 = 49
It is: 2*2*2*3*5 = 120
If they have no prime factors in common, their GCF is 1.
3 x 3 x 3 x 3 = 81
2 x 3 x 5 x 5 = 150
23 is a prime, so there are none, unless you count 23 and 1.
2 x 2 x 3 x 3 x 5 = 180
4 8 15 16 23 42...EXECUTE But seriously... (2^2 * 3^3) = 108
100 is not prime
well 100 isn't prime...