Answer
Multiples of 1689 are:
1689, 3378, 5067, 6756, 8445, 10134, 11823, 13512, 15201, 16890, 18579, 20268, 21957, 23646, 25335, 27024, 28713, 30402, 32091, 33780, 35469, 37158, 38847, 40536, 42225, 43914, 45603, 47292, 48981, 50670, 52359, 54048, 55737, 57426, 59115, 60804, 62493, 64182, 65871, 67560, 69249, 70938, 72627, 74316, 76005, 77694, 79383, 81072, 82761
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