The book is now available! 247
(another Prime Pages' Curiosity)
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+ This number has 47 elements in its Hailstone sequence (also known as the 3x + 1 sequence). [Patterson]

+ Digits sum to its smallest prime factor (247 = 13 x 19 and 2 + 4 + 7 = 13). [Hunter]

(There are 5 curios for this number that have not yet been approved by an editor.)




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