Answer
Multiples of 2121 are:
2121, 4242, 6363, 8484, 10605, 12726, 14847, 16968, 19089, 21210, 23331, 25452, 27573, 29694, 31815, 33936, 36057, 38178, 40299, 42420, 44541, 46662, 48783, 50904, 53025, 55146, 57267, 59388, 61509, 63630, 65751, 67872, 69993, 72114, 74235, 76356, 78477, 80598, 82719, 84840, 86961, 89082, 91203, 93324, 95445, 97566, 99687, 101808, 103929
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