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GIMPS has discovered a new largest known prime number: 2^{82589933}1 (24,862,048 digits) 15667 = 1 * 5^6 + 6*7 is the smallest prime of integers n such that by inserting between their digits + or  or * or / or nothing (ie concatenate two digits) you recover n back in a nontrivial way. [Post]
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