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-86
1308
{1, 53 and 72 lots of -1} ie 1*53*-1*-1*-1 ... *-1
How about: 8*9 = 72 as one example
The factor pairs of 144 are (144, 1) (72, 2) (48, 3) (36, 4) (24, 6) (18, 8) (16, 9) (12, 12) None of them add up to 42.
78
24 and 3
-86
6 + 12 = 18 6 * 12 = 72
-73
1308
60
86
98
{1, 53 and 72 lots of -1} ie 1*53*-1*-1*-1 ... *-1
How about: 8*9 = 72 as one example
72 x 72 = 5,184