Answer
Multiples of 686 are:
686, 1372, 2058, 2744, 3430, 4116, 4802, 5488, 6174, 6860, 7546, 8232, 8918, 9604, 10290, 10976, 11662, 12348, 13034, 13720, 14406, 15092, 15778, 16464, 17150, 17836, 18522, 19208, 19894, 20580, 21266, 21952, 22638, 23324, 24010, 24696, 25382, 26068, 26754, 27440, 28126, 28812, 29498, 30184, 30870, 31556, 32242, 32928, 33614
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