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Mersenne numbers

A Mersenne number is a positive integer of the form 2^p - 1 for a positive integer p.

The first few mersenne numbers are: 3, 7, 15, 31, 63, 127, 255, 511, 1023, 2047, 4095, …

19 of the first one million positive integers are mersenne.

Learn more about mersenne numbers on wikipedia.

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