World!Of
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[ December 10, 2020 ]
The superpermutation of 123 turns out to be
the following length_nine palindrome !
Featuring Dr James Grime

123121321

Click on the above palindrome to start
the explanatory Numberphile youtube video.


A000205 Prime Curios! Prime Puzzle
Wikipedia 205 Le nombre 205

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E-mail address : pdg@worldofnumbers.com