Answer
Multiples of 4221 are:
4221, 8442, 12663, 16884, 21105, 25326, 29547, 33768, 37989, 42210, 46431, 50652, 54873, 59094, 63315, 67536, 71757, 75978, 80199, 84420, 88641, 92862, 97083, 101304, 105525, 109746, 113967, 118188, 122409, 126630, 130851, 135072, 139293, 143514, 147735, 151956, 156177, 160398, 164619, 168840, 173061, 177282, 181503, 185724, 189945, 194166, 198387, 202608, 206829
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