Answer
Multiples of 1641 are:
1641, 3282, 4923, 6564, 8205, 9846, 11487, 13128, 14769, 16410, 18051, 19692, 21333, 22974, 24615, 26256, 27897, 29538, 31179, 32820, 34461, 36102, 37743, 39384, 41025, 42666, 44307, 45948, 47589, 49230, 50871, 52512, 54153, 55794, 57435, 59076, 60717, 62358, 63999, 65640, 67281, 68922, 70563, 72204, 73845, 75486, 77127, 78768, 80409
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