The factors of -12 that add up to 1 are 4 and -3.
212
4 and 12
12+12+12+12
-144
375
-38
-1, 6 and -12.
-10 and 2 -12 and 4 -20 and 12
The only number between 30 and 40 with distinct prime factors which add up to 12 is 35.
237
Well, 18 and 3 (both factors of 36) add up to 21. As well, the factors 12 and 9 add up to 21.