Answer
Multiples of 1991 are:
1991, 3982, 5973, 7964, 9955, 11946, 13937, 15928, 17919, 19910, 21901, 23892, 25883, 27874, 29865, 31856, 33847, 35838, 37829, 39820, 41811, 43802, 45793, 47784, 49775, 51766, 53757, 55748, 57739, 59730, 61721, 63712, 65703, 67694, 69685, 71676, 73667, 75658, 77649, 79640, 81631, 83622, 85613, 87604, 89595, 91586, 93577, 95568, 97559
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