Answer
Multiples of 660 are:
660, 1320, 1980, 2640, 3300, 3960, 4620, 5280, 5940, 6600, 7260, 7920, 8580, 9240, 9900, 10560, 11220, 11880, 12540, 13200, 13860, 14520, 15180, 15840, 16500, 17160, 17820, 18480, 19140, 19800, 20460, 21120, 21780, 22440, 23100, 23760, 24420, 25080, 25740, 26400, 27060, 27720, 28380, 29040, 29700, 30360, 31020, 31680, 32340
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