1 3 29 and 87.
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' 1 ' is the only number that divides evenly into both 87 and 100.
The common factors of 609 and 957 are 1, 3, 29 and 87. No 3-digit numbers.
29
348
Take any multiple of 87, and you get a number that is divisible by 87 - for example:87 x 0 87 x 1 87 x 2 87 x 3 ... 87 x (-1) 87 x (-2) ...