1 x 17 or 17 x 1
17 and 17, if you multiply them.
The two numbers you multiply together to equal 391 are 17 by 23.
3 times 17
-17
47
19 and 17 equal to 323
17 x 2 = 34
13 x 17 = 221
-17
1 x 85, 5 x 17
1 x 85, 5 x 17,
(-7/2 + √17/2) ≈ -1.438 and (-7/2 - √17/2) ≈ -5.562