Hellenica World

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30

30 = 2 * 3 * 5 = 12 + 22 + 32 +42

230 - 1 = 3 * 3 * 7 * 11 * 31 * 151 * 331

1030 - 1 =  3 * 3 * 3 * 7 * 11 * 13 * 31 * 37 * 41 * 211 * 241 * 271 * 2161 * 9091 * 2906161

29 - 30 - 31

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