Answer
Multiples of 639 are:
639, 1278, 1917, 2556, 3195, 3834, 4473, 5112, 5751, 6390, 7029, 7668, 8307, 8946, 9585, 10224, 10863, 11502, 12141, 12780, 13419, 14058, 14697, 15336, 15975, 16614, 17253, 17892, 18531, 19170, 19809, 20448, 21087, 21726, 22365, 23004, 23643, 24282, 24921, 25560, 26199, 26838, 27477, 28116, 28755, 29394, 30033, 30672, 31311
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