https://hackerpaper.kaipfister.de/p/1209.2007/Collected HN comments and submissions linking this paper.enMon, 02 Nov 2026 11:16:22 GMThttps://news.ycombinator.com/item?id=38147207urn:hackerpapers:mention:1209.2007:38147207Sun, 05 Nov 2023 01:49:35 GMT<p>Some good answers and discussion at https://math.stackexchange.com/questions/120/why-is-1-not-a-... In particular, the papers &quot;What is the smallest prime?&quot; https://arxiv.org/abs/1209.2007 and &quot;The History of the Primality of One: A Selection of Sources&quot; https://cs.uwaterloo.ca/journals/JIS/VOL15/Caldwell2/cald6.h... have good history on the matter (e.g. 1, 2, and 3 were all answers at various points — note that at some point in history 1 wasn&#x27;t even considered a number).</p><p><a href="https://hackerpaper.kaipfister.de/p/1209.2007/">Paper and discussion history</a>. A mention is not an endorsement.</p>math.HOhttps://news.ycombinator.com/item?id=37276208urn:hackerpapers:mention:1209.2007:37276208Sat, 26 Aug 2023 19:50:10 GMT<p>Whether 1 should be a prime number or not wasn&#x27;t clear-cut for centuries. Current consensus has settled on excluding 1 from the definition, but there are examples of publications well into the 20th century that still included 1 as prime. Fascinating read about the subject: https://arxiv.org/pdf/1209.2007.pdf</p><p><a href="https://hackerpaper.kaipfister.de/p/1209.2007/">Paper and discussion history</a>. A mention is not an endorsement.</p>math.HO