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GIMPS has discovered a new largest known prime number: 282589933-1 (24,862,048 digits)

+ The Mathematics Department at the University of Illinois had their postage meter changed to stamp "211213 - 1 IS PRIME" after a record-breaking Mersenne prime was found there in 1963.

+ The smallest prime formed by inserting the same digit in between three successive numbers. [Loungrides]

+ The smallest prime p formed by inserting a prime digit between the first double-digit twin prime pair. Curiously, sod(p) is a perfect cube. [Bajpai]

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