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Release Schedule for Upcoming Problems

  • Problem 883 is scheduled for Sunday, 24th March 2024, 04:00 am

Recent News

7 June 2023: Summer Break

Problem 851 on Sunday July 09 will be the last problem of this academic year. After the summer break the first problem of the new academic year will be published on Saturday September 02 at 13:00 (UTC).

27 January 2023: Upcoming Maintenance (Website Inaccessible)

On Friday 3 February 2023 our hosts are migrating their entire VPS platform to a new data centre. During this time Project Euler will be taken offline and the website will not be accessible.

The process will commence on Friday, 3 February 2023 at 22:00 (BST) and it is estimated to take 6-8 hours. After which all normal services should resume.

Problem 828 is scheduled for Saturday, 4th February 2023 at 16:00 (BST). We do not envisage that this move will have any impact on this, but if we become aware that the process is going to overlap and/or certain parts of the world are having issues connecting to the site, then we will delay the release of the problem for 24 hours. It is likely to proceed without any problems, but clearly we cannot be certain until the migration is complete. Hopefully having advance notice will prove to be useful.

Please note that our alternative forum: https://projecteuler.chat runs on a different platform and will remain accessible during the whole time. We will use the forum if we need to communicate any issues of which we become aware.

9 May 2022: Summer break

On 9 July this year we will publish the last problem for this academic year. After the summer break we will publish the first problem of the new academic year on Sunday 11 September at 01:00 (UTC).

5 May 2022: Site Update

A few changes have been made to the website. The most notable change will be the artwork for the Levels. As the problem set continued to grow, the number of unused images in reserve was beginning to become depleted. Consequently, they have been replaced with a more colourful, interesting, and sustainable set of images that should last us many problems into the future.

For some time it has been possible to pin problems that you find interesting and/or would like to revisit. Perhaps less well known was the ability to show the details of your pinned problems on one page by viewing the Archives page. The link is found just above the table of problems on the Archive page. This is not a new feature, but we thought it would be useful to let members know, in case you were unaware.

Due to the size of the problem set growing so large, an unfortunate, but necessary decision was previously made to remove the ability to view all problems on one page. The amount of data being generated to display every problem had become unreasonably large. A number of members were naturally disappointed that this feature was removed. So, they may be pleased to learn that a compromised feature has just been introduced. If you are viewing all problems on the Archive page in ascending order by ID, there will be a link to display all the problems on the current page. For example, if you are viewing page 1, then you can display the details of problems 1-50 on a single page. We shall have to monitor this to ensure that it doesn't consume too much bandwidth.

As always, with changes like this there may be unanticipated issues. Please report any issues on our forum:
https://projecteuler.chat/viewtopic.php?t=7468

17 September 2021: Server Move

During the weekend of Friday 24 September 2021, Project Euler is moving to a new server. As a result we have decided to suspend any problem release during that weekend.

The move will begin on Friday evening (Central European Time). During this time the current server will be taken offline to allow the database to be transferred. After the data has been moved it will be necessary to update the DNS settings. Once your local DNS server has been updated you should be automatically directed to the new server. However, it can take up to 24 hours for the new settings to propagate throughout the world and during this time you may encounter some instability, finding yourself being directed to the old and the new server.

It is hoped that the move happens without incident, but we kindly ask you to be patient during this time and apologise for the inconvenience that this may cause.