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Project Euler
What Project Euler is
Project Euler is a web collection of mathematical and computer programming problems, most of which call for a computer and programming skills. The site presents the challenges as recreational exercises for exploring unfamiliar areas and learning new concepts. Its intended audience includes students, adults interested in mathematics, and professionals who want to keep their problem-solving and mathematics skills current.
The problem archive lists problems 1 through 1003, and a separate recent page displays the ten latest published problems. Upcoming release dates and times appear on the News page. Tracking progress requires an account and cookies enabled; registration is free. Members can create closed groups with ranked tables showing progress and solve times. Friends and group members can see a member’s progress page even if that member has hidden the public profile. Accounts use usernames and passwords, without requiring real names, email addresses, or IP addresses. The site says it does not share database information with third parties. Since accounts have no verifiable personal information, lost passwords cannot be recovered, though members can generate an emergency recovery key.
Who it suits
Project Euler suits students, mathematics enthusiasts, and professionals who want recreational programming and mathematics problems. It is also suited to learners who want to explore unfamiliar topics or keep problem-solving skills current, with free accounts for progress tracking and group participation.
What it does well
- Free registration supports progress tracking.
- Archive lists problems 1 through 1003.
- News page publishes upcoming problem release dates and times.
- Closed groups provide ranked progress and solve-time tables.
- Accounts do not require real names, email addresses, or IP addresses.
What to know first
- Tracking progress requires an account and cookies enabled.
- Lost passwords cannot be recovered by the site.
- Friends and group members can see progress pages despite a hidden public profile.
Limits
The free plan provides free registration, but progress tracking requires an account and cookies enabled. Lost passwords cannot be recovered, although members can generate an emergency recovery key.
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| Free | Free registration · account required to track progress | Free |
As projecteuler.net lists them, read 9 Oct 2026. The maker's own page has the final word.
Getting started
- Open the Project Euler website in a web browser.
- Browse the problem archive or recent problems.
- Register for free if you want progress tracking.
- Enable cookies to track progress.
- Create a closed group if you want a ranked table for members.
Verdict
Pick Project Euler if you want a free web collection of mathematics and programming exercises, with progress tracking and closed groups. Look elsewhere if you need account recovery after losing a password or want progress hidden from friends and group members.
Questions
Is Project Euler free?
Yes. The Free plan costs nothing, and registration is free.
What platforms does it support?
Project Euler is available on the web.
How many problems are in the archive?
The archive lists problems 1 through 1003. The recent page shows the ten most recently published problems.
Can I recover a lost password?
The site cannot recover an account password because accounts have no verifiable personal information. Members can generate an emergency recovery key.
What information do accounts use?
Accounts use usernames and passwords and do not require real names, email addresses, or IP addresses. Project Euler says it does not share database information with third parties.
Facts from Project Euler's own pages
- Account recovery
- Because accounts have no verifiable personal information, the site cannot recover an account if its password is lost; members can generate an emergency recovery key. · projecteuler.net, 9 Oct 2026
- Audience
- The problems are aimed at students, adults interested in mathematics, and professionals who want to keep their problem-solving and mathematics skills current. · projecteuler.net, 9 Oct 2026
- Community groups
- Groups let members create closed communities with ranked tables showing members’ progress and when they solved each problem. · projecteuler.net, 9 Oct 2026
- Data collection
- The privacy policy says accounts do not require or store real names, email addresses, or IP addresses; accounts use usernames and passwords. · projecteuler.net, 9 Oct 2026
- Data sharing
- Project Euler says it does not share database information with third parties. · projecteuler.net, 9 Oct 2026
- Group visibility
- Friends and group members can see a member’s progress page even when that member has hidden their public profile. · projecteuler.net, 9 Oct 2026
- Problem archive
- The archive lists problems 1 through 1003, and the recent page shows the ten most recently published problems. · projecteuler.net, 9 Oct 2026
- Problem-solving policy
- The site says solve times are automatically processed and profiles with unrealistic solve patterns may be flagged for review and marked untrusted. · projecteuler.net, 9 Oct 2026
- Progress tracking
- Tracking progress requires an account and cookies enabled; registration is free. · projecteuler.net, 9 Oct 2026
- Purpose
- The site aims to help people explore unfamiliar areas and learn new concepts in a fun, recreational context. · projecteuler.net, 9 Oct 2026
- Release schedule
- The site publishes upcoming problem release dates and times on its News page. · projecteuler.net, 9 Oct 2026
- Security
- The site says connections use HTTPS and that passwords and account recovery keys are hashed using PHP’s one-way password hashing algorithm. · projecteuler.net, 9 Oct 2026
- Support
- Privacy or security concerns can be sent to [email protected]; other queries are directed to the alternative forum. · projecteuler.net, 9 Oct 2026
- What it is
- Project Euler is a series of challenging mathematical and computer programming problems, most of which require a computer and programming skills to solve. · projecteuler.net, 9 Oct 2026
Where Project Euler stands on Freedom251
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