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GIMPS has discovered a new largest known prime number: 2^{82589933}1 (24,862,048 digits) Just showing those entries submitted by 'Capelle': (Click here to show all)
A factorial expression involving the digits of 23 is 1! + (2! + 2!) + (3! + 3! + 3!). [Capelle] The smallest nonreflectable nonstrobogrammatic noninvertible nonpalindromic nonreversible prime number. [Capelle] There are 23 known natural numbers n such that 2^{n} does not contain the digit 2. Their sum ends with 23, which is one of them. The prime cases are easy to remember: 2, 3, 23 and ... the 23th prime! [Capelle] The largest known prime number that cannot be written as the sum of at most three powerful numbers. [Capelle]
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