Answer
Multiples of 321 are:
321, 642, 963, 1284, 1605, 1926, 2247, 2568, 2889, 3210, 3531, 3852, 4173, 4494, 4815, 5136, 5457, 5778, 6099, 6420, 6741, 7062, 7383, 7704, 8025, 8346, 8667, 8988, 9309, 9630, 9951, 10272, 10593, 10914, 11235, 11556, 11877, 12198, 12519, 12840, 13161, 13482, 13803, 14124, 14445, 14766, 15087, 15408, 15729
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