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

+ There are 2339 ways to arrange the set of twelve pentominoes into a 6-by-10 rectangle, excluding trivial variations obtained by rotation and reflection of the whole rectangle, but including rotation and reflection of a subset of pentominoes. This case was first solved in 1960 by C. B. Haselgrove and Jenifer Haselgrove (now Jenifer Leech).

+ The smallest prime whose fourth power is pandigital (i.e., containing all digits from 0 to 9). [Gupta]

+ The sum of the first 2339 (a prime total) odd composites (9 + 15 + 21 + ... + 6321) is a palindromic prime (7576757). [De Geest]

(There is one curio for this number that has not yet been approved by an editor.)

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