Simon Willison’s Weblog

Largest known prime number (via) Discovered on 12th October 2024 by the Great Internet Mersenne Prime Search. The new largest prime number is 2^136279841-1 - 41,024,320 digits long.

Posted 2nd January 2025 at 7:39 am

Recent articles

Recreating the Apollo AI adoption rate chart with GPT-5, Python and Pyodide - 9th September 2025
GPT-5 Thinking in ChatGPT (aka Research Goblin) is shockingly good at search - 6th September 2025
V&A East Storehouse and Operation Mincemeat in London - 27th August 2025

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