ART

31

31 = 50 + 51 + 52 = 20 + 21 + 22 + 23 + 24

31 = 4!+ (4!+4)÷4.

231 - 1 = 2147483647

1031 - 1 = 3 * 3 * 2791 * 6943319 * 57336415063790604359

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