Answer
Multiples of 1686 are:
1686, 3372, 5058, 6744, 8430, 10116, 11802, 13488, 15174, 16860, 18546, 20232, 21918, 23604, 25290, 26976, 28662, 30348, 32034, 33720, 35406, 37092, 38778, 40464, 42150, 43836, 45522, 47208, 48894, 50580, 52266, 53952, 55638, 57324, 59010, 60696, 62382, 64068, 65754, 67440, 69126, 70812, 72498, 74184, 75870, 77556, 79242, 80928, 82614
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