Answer
Multiples of 561 are:
561, 1122, 1683, 2244, 2805, 3366, 3927, 4488, 5049, 5610, 6171, 6732, 7293, 7854, 8415, 8976, 9537, 10098, 10659, 11220, 11781, 12342, 12903, 13464, 14025, 14586, 15147, 15708, 16269, 16830, 17391, 17952, 18513, 19074, 19635, 20196, 20757, 21318, 21879, 22440, 23001, 23562, 24123, 24684, 25245, 25806, 26367, 26928, 27489
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