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Anonymous
1, 13, 19 and 247.
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247, 494 (=247*2), 741 (=247*3) etc.
There are no two numbers between 10 and 20 with a product of 247.
1 13 19 247.
1, 3, 13, 19, 39, 57, 247, 741.
The two prime numbers 13*19=247