Answer
Multiples of 409 are:
409, 818, 1227, 1636, 2045, 2454, 2863, 3272, 3681, 4090, 4499, 4908, 5317, 5726, 6135, 6544, 6953, 7362, 7771, 8180, 8589, 8998, 9407, 9816, 10225, 10634, 11043, 11452, 11861, 12270, 12679, 13088, 13497, 13906, 14315, 14724, 15133, 15542, 15951, 16360, 16769, 17178, 17587, 17996, 18405, 18814, 19223, 19632, 20041
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