They are: 9*13 = 117 and 117/9 = 13
90 is composite, 117 is prime.
10 numbers in a billion
1 and 117, or 3 and 39, etc
1 x 117, 3 x 39, 9 x 13 = 117
9*13 = 117
They are: 9*13 = 117 and 117/9 = 13
a billion numbers
9 x 13 = 117
90 is composite, 117 is prime.
10 numbers in a billion
1, 3, 9, 13, 39, 117
1, 3, 9, 13, 39, 117
32 x 13 = 117
1 and 117, or 3 and 39, etc
1 x 117, 3 x 39, 9 x 13 = 117
117 and 225, yes. The rest, no.