Answer
Multiples of 2181 are:
2181, 4362, 6543, 8724, 10905, 13086, 15267, 17448, 19629, 21810, 23991, 26172, 28353, 30534, 32715, 34896, 37077, 39258, 41439, 43620, 45801, 47982, 50163, 52344, 54525, 56706, 58887, 61068, 63249, 65430, 67611, 69792, 71973, 74154, 76335, 78516, 80697, 82878, 85059, 87240, 89421, 91602, 93783, 95964, 98145, 100326, 102507, 104688, 106869
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