Answer
Multiples of 681 are:
681, 1362, 2043, 2724, 3405, 4086, 4767, 5448, 6129, 6810, 7491, 8172, 8853, 9534, 10215, 10896, 11577, 12258, 12939, 13620, 14301, 14982, 15663, 16344, 17025, 17706, 18387, 19068, 19749, 20430, 21111, 21792, 22473, 23154, 23835, 24516, 25197, 25878, 26559, 27240, 27921, 28602, 29283, 29964, 30645, 31326, 32007, 32688, 33369
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