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Project Euler is offline

Screenshot of projecteuler.net captured 2026-07-20
Page preview · captured 2026-07-20

Resurfaced independently across 11 calendar years, with breakout response in 4 of them.

submissions
18
submitters
17
observed span
2007–2025
peak thread · 163 comments
792 pts
latest 20+ return · 2025-11-12
566 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

After hearing about it for years, I decided to start working through Project Euler about two weeks ago. It really is much more about math than programming, although it's a lot of fun to take on the problems with a language that has tail call optimization because so many of the problems involve recurrence relations. I like that the problems are constructed in a way that usually punishes you for trying to use brute force. Sometimes there's a problem that…

12 years ago I was a failed computer science student, wasting my time on drugs. Having failed so many classes I did not see any future at all, and I was considering killing myself to get out of the anxiety and stress. My confidence regarding programming etc was 0. I decided to apply for a junior developer job. I got an interview and to prepare for an interview I found this site, Project Euler. I did ten or so tasks…

For people that love Project Euler, check out project rosalind! http://rosalind.info/about/ Conceptually similar, but the problems are focused around bioinformatics. Most lot of the problems contain some background context that teaches you a little biology/statistics as well.

ajakate·331-point thread·

The best technical interview I ever had involved picking a random Project Euler problem in the hundreds and pair-programming our way through it. The CTO wrote his version in Python and I worked in Perl . . . he was astounded mine ran 8x faster. The same company also had regular hack night where everyone drinks a lot of Tecate, agress on a Project Euler problem and a language no one knows, and races. Fun times.

jboggan·306-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
4

100+ points or 50+ comments

Total points
2266

reference only — not used in Hall rules or ranking

Total comments
626

reference only — not used in Hall rules or ranking

Every submission

DateTitle as submittedByPointsComments
2007-12-05Project Euler - Fun Math and Programming ProblemsBluem003410
2010-12-17Project Eulersnth71
2013-12-01Project Euler is downabhshkdz30
2014-01-14Project EulerFirst breakoutgprasanth306134
2014-06-15Project Euler is offlinesnth11719
2015-01-08Project Eulerjeremynixon20
2015-08-02Project Euler has been hackeddonutboy8035
2017-12-01To learn to read what you needdushyantk20
2017-12-10Project EulerHall induction · Best threadvinchuco792163
2020-03-29Project Eulerdimastopel10
2020-12-17Project Euler: challenging mathematical/computer programming problemsKelamir21
2020-12-21Project Eulerbristleworm30
2021-03-16Project Eulerrococode20
2021-11-13Project Eulertosh331128
2023-10-23Project Euleralexanderameye120
2024-04-29Project Eulerudev409631
2025-08-20Project EulerEPendragon30
2025-11-12Project EulerLatest 20+ point returnswatson741566134