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When Samuel Yates started maintaining a list of the largest
known prime numbers in 1979, M(44497) was the largest of
all. It has 13395 decimal digits and was discovered to be
prime by David Slowinski and Harry L. Nelson in April of
that year. [Dobb]
The last term in the sequence which contains Mersenne prime exponents that are less than 50000 and starts with 4 (4253, 4423, 44497). Note that 4253 starts with one 4, and 4423 starts with two 4's, and 44497 starts with three 4's. [Jeong]
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