Update 2025-12-23 (PST) (AI summary of creator comment): If the market is at 1% at resolution time, the creator may resolve to N/A instead of determining whether 1 is prime.
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jk nvm
@prismatic Nothing is 'resolved'.
The market is closed but I think it did close at the originally specified time (9:59 AM by my time zone) ... I saw no indication that manual intervention closed it early.
The last major mathematician who listed '1' as a prime was Hardy, in his 1921 "A course of pure mathematics"
By the 1944 edition, and possibly earlier, 1 was no longer in the list of presented primes in this book. Moreover even Hardy excluded '1' as prime in some contexts, as other mathematicians did.
For most mathematicians, the question had been settled by Gauss in 1798.
An interesting note, if you research this history... '1' was not even considered a number by many people until the 16th century, and as late as Fermat apparently there were some who did not consider it one.
...anyway, in the modern context, arguing for '1' to be considered prime feels akin to sedevacantism or some other rather intentional embrace of contrarian positions.
I do not expect that to actually come up at resolution time, though.