Answer
Multiples of 213 are:
213, 426, 639, 852, 1065, 1278, 1491, 1704, 1917, 2130, 2343, 2556, 2769, 2982, 3195, 3408, 3621, 3834, 4047, 4260, 4473, 4686, 4899, 5112, 5325, 5538, 5751, 5964, 6177, 6390, 6603, 6816, 7029, 7242, 7455, 7668, 7881, 8094, 8307, 8520, 8733, 8946, 9159, 9372, 9585, 9798, 10011, 10224, 10437
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