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Largest known prime number. As of January 2017, the largest known prime number is 274,207,281 â 1, a number with 22,338,618 digits. It was found in 2016 by the Great Internet Mersenne Prime Search (GIMPS). Plot of the number of digits in largest known prime by year, since the electronic computer. Note that the vertical scale is logarithmic. The red line is the exponential curve of best fit: y = exp(0.187394 t - 360.527), where t is in years.
while the term prime number commonly refers to prime positive integers other types of primes are also defined such as the gaussian primes the number 1 is a special case which is considered neither prime nor composite wells 1986 p 31arge primes caldwell include the large mersenne primes ferrier s prime and the digit counterexample showing that 5359 is not a sierpiÅski number of the second kind helm and norris the largest known prime as of january 2013 is the mersenne prime which has a whopping decimal digits