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New Mersenne Prime discovered (probably)

Screenshot of www.mersenne.org captured 2026-07-20
Page preview · captured 2026-07-20

Resurfaced independently across 5 calendar years, with breakout response in 2 of them.

submissions
8
submitters
8
observed span
2015–2024
peak thread · 120 comments
368 pts
latest 20+ return · 2024-10-16
368 pts

Submission timeline

2007–2026

One slot for every year since HN launched. Height is that year's peak points; orange marks a 100+ point or 50+ comment breakout. Select a bar to open its strongest thread.

First comments on top threads

HN comment order

I can swear something like 20+ years ago I found a new one too, but I didn’t realize the importance of it. I had just downloaded GIMPS and I was just messing around with it, and when I saw the message I thought “ok, cool!” and proceeded to turn it off.

ziofill·368-point thread·

I think one of the biggest mysteries (in my mind anyway), is how Mersenne found his original list of primes. Yes, some were shown to be incorrect and some he missed...but him finding the amount that he did still seems amazing to me, and I don't believe this has ever been explained. It seems to me like he had a private method for calculating primes (that was imperfect, sure, but also astounding for being developed in the 17th century). To…

Probably known better as a CPU stress test in the overclocking world - the famous Prime95. People run it for x hours straight to prove system stability. Linux overclockers can get in on the fun too. On Gentoo it's installed with "emerge gimps" and the stress test is launched with "/opt/gimps/mprime -t".

Discussion from yesterday https://news.ycombinator.com/item?id=10931234

sp332·9-point thread·

The first top-level comment from each of the four biggest threads, in HN’s own order. Excerpts are shortened; open a comment for full context.

Breakout years
2

100+ points or 50+ comments

Total points
575

reference only — not used in Hall rules or ranking

Total comments
242

reference only — not used in Hall rules or ranking

Every submission

DateTitle as submittedByPointsComments
2015-04-11Great Internet Mersenne Prime Searchbrudgers273
2016-01-20Largest Known Prime, 49th Known Mersenne Prime Foundtaylorbuley92
2021-10-10M(57885161) verified as 48th Mersenne PrimeFirst breakoutmattashii163116
2023-03-16Great Internet Mersenne Prime Searchlagniappe30
2023-07-07Great Internet Mersenne Prime SearchRyanShook20
2023-11-14Great Internet Mersenne Prime Searchbebop40410
2024-10-14New Mersenne Prime discovered (probably)gpcr194921
2024-10-16New Mersenne Prime discovered (probably)Hall induction · Best thread · Latest 20+ point returnsdsykes368120