hmm I haven't fully tested my hypothesis, but, 3196 is the only number that can be divided by a whole number to give a whole number answer. e.g, 2, 4, 34, although that seems abit to simple, but then again some things ARE simple.
Ha I see it.. 3196 is the only one whos first and last number when multiplied do not equal the two digit number in the middle.... 7213: 7x3 = 21 8405: 8x5 = 40 2189: 2x9 = 18 8567: 8x7 = 56
But 3196: 3x6 = 18, 18 is not equal to 19
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