Hellenica World

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20

203 = 113 + 123 +133 + 143

220 - 1 = 3 * 5 * 5 * 11 * 31 * 41

1020 - 1 = 3 * 3 * 11 * 41 * 101 * 271 * 3541 * 9091 * 27961

19 - 20 - 21

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