Answer
Multiples of 2421 are:
2421, 4842, 7263, 9684, 12105, 14526, 16947, 19368, 21789, 24210, 26631, 29052, 31473, 33894, 36315, 38736, 41157, 43578, 45999, 48420, 50841, 53262, 55683, 58104, 60525, 62946, 65367, 67788, 70209, 72630, 75051, 77472, 79893, 82314, 84735, 87156, 89577, 91998, 94419, 96840, 99261, 101682, 104103, 106524, 108945, 111366, 113787, 116208, 118629
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