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16

16 = 24 = 42

(only integer solution ab = ba)

216 - 1 = 3 * 5 * 17 * 257

1016 - 1 = 3 * 3 * 11 * 17 * 73 * 101 * 137 * 5882353

15 - 16 - 17

0 - 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9

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