Answer
Multiples of 1420 are:
1420, 2840, 4260, 5680, 7100, 8520, 9940, 11360, 12780, 14200, 15620, 17040, 18460, 19880, 21300, 22720, 24140, 25560, 26980, 28400, 29820, 31240, 32660, 34080, 35500, 36920, 38340, 39760, 41180, 42600, 44020, 45440, 46860, 48280, 49700, 51120, 52540, 53960, 55380, 56800, 58220, 59640, 61060, 62480, 63900, 65320, 66740, 68160, 69580
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