Answer
Multiples of 421 are:
421, 842, 1263, 1684, 2105, 2526, 2947, 3368, 3789, 4210, 4631, 5052, 5473, 5894, 6315, 6736, 7157, 7578, 7999, 8420, 8841, 9262, 9683, 10104, 10525, 10946, 11367, 11788, 12209, 12630, 13051, 13472, 13893, 14314, 14735, 15156, 15577, 15998, 16419, 16840, 17261, 17682, 18103, 18524, 18945, 19366, 19787, 20208, 20629
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