Answer
Multiples of 1680 are:
1680, 3360, 5040, 6720, 8400, 10080, 11760, 13440, 15120, 16800, 18480, 20160, 21840, 23520, 25200, 26880, 28560, 30240, 31920, 33600, 35280, 36960, 38640, 40320, 42000, 43680, 45360, 47040, 48720, 50400, 52080, 53760, 55440, 57120, 58800, 60480, 62160, 63840, 65520, 67200, 68880, 70560, 72240, 73920, 75600, 77280, 78960, 80640, 82320
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