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EXAMPLE
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n a(n) Example of S
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1 1 {1}
2 2 {1,2}
3 6 {2,3,6}
4 18 {4,9,12,18}
5 54 {8,24,27,36,54}
6 120 {45,80,84,90,112,120}
7 240 {45,126,160,168,180,224,240}
8 480 {135,252,270,320,336,360,448,480}
9 960 {504, 640, 672, 720, 756, 810, 896, 945, 960}
10 1920 {1008, 1215, 1280, 1344, 1440, 1512, 1620, 1792, 1890, 1920}
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