13, it's the only prime. All the other ones can be divided by something other than 1.
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15*14*13*12 = 32,76015*14*13*12 = 32,76015*14*13*12 = 32,76015*14*13*12 = 32,760
The answer is 39.
13/13 + 12/14 = 13/7 or 16/7
14 x 14 = 196 13 x 13 = 169 12 x 12 = 144196
11