## Mersenne numberA number of the form 2 ^{n} - 1 (one less than a power of
2), where n is a positive integer. Mersenne numbers are named after
Marin Mersenne who wrote about them in his Cogita
Physica-Mathematica (1644) and wrongly conjectured that they were prime
for n = 2, 3, 5, 7, 13, 17, 19, 31, 67, and 257, and composite for
n > 257. ## Related entry• Mersenne prime## Related category• TYPES OF NUMBERS | |||||

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