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More than 200,000 computers spent years looking for the largest known prime number. It turned up on Michigan State University graduate student Michael Shafers off-the-shelf PC. It was just a matter of time, Shafer said.
THE NUMBER is 6,320,430 digits long and would need 1,400 to 1,500 pages to write out. It is more than 2 million digits larger than the previous largest known prime number.
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