Answer
Multiples of 680 are:
680, 1360, 2040, 2720, 3400, 4080, 4760, 5440, 6120, 6800, 7480, 8160, 8840, 9520, 10200, 10880, 11560, 12240, 12920, 13600, 14280, 14960, 15640, 16320, 17000, 17680, 18360, 19040, 19720, 20400, 21080, 21760, 22440, 23120, 23800, 24480, 25160, 25840, 26520, 27200, 27880, 28560, 29240, 29920, 30600, 31280, 31960, 32640, 33320
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