Answer
Multiples of 399 are:
399, 798, 1197, 1596, 1995, 2394, 2793, 3192, 3591, 3990, 4389, 4788, 5187, 5586, 5985, 6384, 6783, 7182, 7581, 7980, 8379, 8778, 9177, 9576, 9975, 10374, 10773, 11172, 11571, 11970, 12369, 12768, 13167, 13566, 13965, 14364, 14763, 15162, 15561, 15960, 16359, 16758, 17157, 17556, 17955, 18354, 18753, 19152, 19551
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