0
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11, 22, 33, 44, 55.
-10
-11
7
1 and 4
6 and -1
9 and 11.
4 and 11.
1 x 121, 11 x 11.
The only prime number that multiplies to 11 is 11.
29
4
1, 2, 3, 4, 6