520/390 taking 130 as common factor = 4:3
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530
If you mean 156/390 then it is 2/5 in its lowest terms
520
390 squared is 390 times 390 = 152,100
The first 20 multiples of 26: 26, 52, 78, 104, 130, 156, 182, 208, 234, 260, 286, 312, 338, 364, 390, 416, 442, 468, 494, 520 . . . ∞