19 = 7*13
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The factor pairs of 91 are (1,91) and (7,13).
what is a factor string with 1 to 144
The longest factor string is 2x2x2x3x13. It is always best to list your factor string from the least to greatest number.
7*5*4*3*2 Is the longest factor string of 840
1, 7, 13, 91