From Numberphile.

Featuring Matt Parker. Learn for free on Brilliant (and get 20% off a premium subscription) at https://brilliant.org/numberphile (episode sponsor). Extended footnote and other links in full description below ↓↓↓

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FOOTNOTE TO THIS VIDEO
* I contacted Wilfrid Keller after filming about his retired website, and he replied with the following…
"I am delighted by your interest in the topic of ‘Prime factors of generalized Fermat numbers Fm(10) and complete factoring status’. The (constantly updated) webpage with exactly this title is still available at http://www.prothsearch.com/GFN10.html (only the Internet domain has changed to http://www.prothsearch.com/ about nine years ago). Some remarkable results have been achieved in the meantime. The largest prime factor currently known of a number Fm(10) has 4666663 digits (you might also have a look at https://t5k.org/top20/page.php?id=10 ), and large prime factors for m = 14 or 15 are likewise exceptional. May I point out that similar "factoring status" pages are also maintained for bases a = 3, 5, 6, 7, 11, 12 at http://www.prothsearch.com/ "

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