The Great Internet Mersenne Prime Search, a cooperative computing project, helps find a prime that has nearly 13 million digits. LARGEST KNOWN PRIME NUMBER. Printing out all 13 million digits in 12-point type would create a number 30 miles long. But here are a few of the digits, from the beginning and the end of the full number.

Here’s a number to savor: 243,112,609-1

Its form is tidy and lovely: 2n-1

Anyone else turned on?

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