Recent News

Site Update (Thu, 12 Nov 2020)

A new feature has been added that allows you to watch discussion threads. The link to toggle this is found at the top of each discussion thread page. When a thread is being watched, the problem ID will have a box around it in the problems table. But to help you keep track of these threads, you can now filter by Watched. Some members had said it was getting difficult to keep an eye on threads in which they had been following or were involved in a discussion among the ever growing problem set.

In addition, recently it was made possible to view problems in the Chronological order in which you solved them. This is another way to keep track of the most recent threads you might be interested in.

Finally, it should be apparent that the website has received some small cosmetic updates. Hopefully it helps to make Project Euler a little bit tidier.

As always, small changes can introduce unexpected consequences. If you notice any issues, then please report them at the following thread at our alternative forum:

(Thursday 12 November 2020: Site Update)

Wrong answer problem 728 (Sun, 04 Oct 2020)

The wrong answer for problem 728 has been corrected.
Apologies for the inconvenience.
Hopefully everything is OK now

(Sunday 04 October 2020: Wrong answer problem 728)

Website Maintenance (Thu, 30 Jul 2020)

Essential back-end maintenance has been completed to the website today. The changes mainly related to updating security procedures and optimising general performance. Although there should not be many noticeable changes, there have been significant changes to most of the scripts. Whereas a lot of hard work and testing has been done on a local machine before uploading there is no accounting for these changes on a busy live website. If you notice any bugs, then could you please use the following thread at our forum:

(Thursday 30 July 2020: Website Maintenance)

Summer break (Fri, 19 Jun 2020)

We hope that Project Euler has contributed to the well-being of its members with so many of us in lockdown during the past few months.
Problem 723 on Sunday 5th July will be the last problem of this remarkable season.
Project Euler will then take a summer break, returning with a new problem on Saturday 5th September, 13:00 UTC.
Stay healthy.

(Friday 19 June 2020: Summer break)

Saving Draft Posts (Sat, 25 Apr 2020)

Many of us have experienced the frustration of taking the time to write that perfect post and, for whatever reason, the post was lost before it was published.

In an attempt to address this potential issue, a new feature has been added to Whilst you are composing or editing a post in one of the problem threads, a draft of your post will be saved in your own browser's local storage. In theory, this would allow your post to be recovered in the event of an unexpected page error or accidentally navigating away from the page. If you cancel or successfully publish your post, then the data for that post will be deleted from local storage. It should also be noted that when you sign-out, all of the contents of your local storage for Project Euler will be cleared. Our privacy policy has been updated to include this information.

We hope that you find this feature useful.

(Saturday 25 April 2020: Saving Draft Posts)