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19
6 x 2 + 6 + 18
2x2x2x3x3x32^3 x 3^32 x 2 x 2 x 3 x 3 x 32 x 2 x 2 x 3 x 3 x 3 = 216
No number under 100 has four distinct prime factors, but these might qualify... 2 x 2 x 2 x 2 = 16 3 x 3 x 3 x 3 = 81 2 x 2 x 2 x 3 = 24 2 x 2 x 2 x 5 = 40 2 x 2 x 2 x 7 = 56 2 x 2 x 2 x 11 = 88 2 x 2 x 3 x 3 = 36 2 x 2 x 3 x 5 = 60 2 x 2 x 3 x 7 = 84 2 x 3 x 3 x 3 = 54 2 x 3 x 3 x 5 = 90
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