Answer
Multiples of 423 are:
423, 846, 1269, 1692, 2115, 2538, 2961, 3384, 3807, 4230, 4653, 5076, 5499, 5922, 6345, 6768, 7191, 7614, 8037, 8460, 8883, 9306, 9729, 10152, 10575, 10998, 11421, 11844, 12267, 12690, 13113, 13536, 13959, 14382, 14805, 15228, 15651, 16074, 16497, 16920, 17343, 17766, 18189, 18612, 19035, 19458, 19881, 20304, 20727
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