Answer
Multiples of 521 are:
521, 1042, 1563, 2084, 2605, 3126, 3647, 4168, 4689, 5210, 5731, 6252, 6773, 7294, 7815, 8336, 8857, 9378, 9899, 10420, 10941, 11462, 11983, 12504, 13025, 13546, 14067, 14588, 15109, 15630, 16151, 16672, 17193, 17714, 18235, 18756, 19277, 19798, 20319, 20840, 21361, 21882, 22403, 22924, 23445, 23966, 24487, 25008, 25529
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