31- not divisable by 3 (3 x 11= 33), 4 (4 x 9= 36), 5 (doesn't end in 5 or 0) or 2 (last # not even)
oh, 17 works too... and probably a ton of other numbers.
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13
12 is the smallest multiple of 3 and 4.
96
21
I assume you mean LCM, least common multiple. The least common multiple of 3 and 4 is 12. 12 is a multiple of 3. 12 is a multiple of 4. No smaller number is a multiple of both 3 and 4.