Answer
Multiples of 1681 are:
1681, 3362, 5043, 6724, 8405, 10086, 11767, 13448, 15129, 16810, 18491, 20172, 21853, 23534, 25215, 26896, 28577, 30258, 31939, 33620, 35301, 36982, 38663, 40344, 42025, 43706, 45387, 47068, 48749, 50430, 52111, 53792, 55473, 57154, 58835, 60516, 62197, 63878, 65559, 67240, 68921, 70602, 72283, 73964, 75645, 77326, 79007, 80688, 82369
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