Answer
Multiples of 1399 are:
1399, 2798, 4197, 5596, 6995, 8394, 9793, 11192, 12591, 13990, 15389, 16788, 18187, 19586, 20985, 22384, 23783, 25182, 26581, 27980, 29379, 30778, 32177, 33576, 34975, 36374, 37773, 39172, 40571, 41970, 43369, 44768, 46167, 47566, 48965, 50364, 51763, 53162, 54561, 55960, 57359, 58758, 60157, 61556, 62955, 64354, 65753, 67152, 68551
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