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Privacy Policy

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The OEIS Privacy Policy

This page describes the Privacy Policy of The OEIS Foundation Inc and of The On-Line Encyclopedia of Integer Sequences ("OEIS") Website


This privacy policy has been compiled to better serve those who are concerned with how their 'Personally Identifiable Information' (PII) is being used online. PII, as used in US privacy law and information security, is information that can be used on its own or with other information to identify, contact, or locate a single person, or to identify an individual in context. Please read this privacy policy carefully to get a clear understanding of how we collect, use, protect or otherwise handle your Personally Identifiable Information in accordance with our website.

What personal information do we collect?

The OEIS is a scientific database, and if you wish to register with us so you can contribute to the OEIS, we will ask you to provide your name, email address, and a brief biography. Anyone may use the OEIS web site without registering, in which case we do not collect any Personally Identifiable Information.

When do we collect information?

We collect information from you when you register on our site or change your registration information on our site.

How do we use your information?

Since the OEIS is a scientific database, it is important that users have some information about the contributors, and, if it is feasible and appropriate, some way of reaching them. Your name and brief biography are saved in your User Page, which can be seen by anyone. Your email address is not made public, but anyone can send you email from your User Page.

How do we protect visitor information?

As described above, the only non-public visitor information we collect is email addresses from registered users.

These email addresses and our own system logs are stored on a secured server and accessible by a limited number of persons who have special access rights and are required to keep the information confidential.

Do we use cookies?

Yes. Cookies are small files that a site or its service provider transfers to your computer's hard drive through your Web browser (if you allow) that enables the site's or service provider's systems to recognize your browser and remember certain information. For example, if you are logged in, we recognize that by use of a cookie stored in your browser. We may also use cookies to help us understand your preferences based on previous or current site activity, which enables us to provide you with improved services in the future. We may also use cookies to help us compile aggregate data about site traffic and site interaction so that we can offer better site experiences and tools in the future.

You can choose to have your computer warn you each time a cookie is being sent, or you can choose to turn off all cookies. You do this through your browser (like Internet Explorer) settings. Each browser is a little different, so look at your browser's Help menu to learn the correct way to modify your cookies.

What happens if users disable cookies in their browser?

If you disable cookies, you will not be able to log in to the web site and make changes. However, you will still be able to use the web site for searches and reading.

Third Party Disclosure

We do not sell, trade, or otherwise transfer to outside parties your personally identifiable information.

Third party links

We do not include or offer third party products or services on our website.

California Online Privacy Protection Act

CalOPPA is the first state law in the nation to require commercial websites and online services to post a privacy policy. The law's reach stretches well beyond California to require a person or company in the United States (and conceivably the world) that operates websites collecting personally identifiable information from California consumers to post a conspicuous privacy policy on its website stating exactly the information being collected and those individuals with whom it is being shared, and to comply with this policy. - See more at

As recommended by CalOPPA we agree to the following:

  • Users can visit our site anonymously
  • Once this privacy policy is created, we will add a link to it on our home page, or as a minimum on the first significant page after entering our website.
  • Our Privacy Policy link includes the word 'Privacy', and can be easily be found on the page specified above.
  • Users will be notified of any privacy policy changes through the present Privacy Policy page
  • Users are able to change their personal information by logging in to their User Page

How does our site handle "Do Not Track" signals?

We honor "Do Not Track" signals and do not track, plant cookies, or use advertising when a Do Not Track (DNT) browser mechanism is in place. If a user using a Do Not Track browser logs in to the site, we still use a cookie to identify the logged-in session.

COPPA (Children Online Privacy Protection Act)

When it comes to the collection of personal information from children under 13, the Children's Online Privacy Protection Act (COPPA) puts parents in control. The Federal Trade Commission, the nation's consumer protection agency, enforces the COPPA Rule, which spells out what operators of websites and online services must do to protect children's privacy and safety online.

We do not specifically market to children under 13.

Fair Information Practices

The Fair Information Practices Principles form the backbone of privacy law in the United States and the concepts they include have played a significant role in the development of data protection laws around the globe. Understanding the Fair Information Practice Principles and how they should be implemented is critical to comply with the various privacy laws that protect personal information.

In order to be in line with Fair Information Practices we will take the following responsive action, should a data breach occur:

  • We will notify the users via in site notification within 1 business day
  • We also agree to the individual redress principle, which requires that individuals have a right to pursue legally enforceable rights against data collectors and processors who fail to adhere to the law. This principle requires not only that individuals have enforceable rights against data users, but also that individuals have recourse to courts or a government agency to investigate and/or prosecute non-compliance by data processors.


The CAN-SPAM Act is a law that sets the rules for commercial email, establishes requirements for commercial messages, gives recipients the right to have emails stopped from being sent to them, and spells out tough penalties for violations.

As stated above, we are a scientific database, and we collect your email address to make it possible for users of the OEIS database to get in touch with you through the OEIS Wiki in case there is a question about one of your submissions to the OEIS. (However, your email address is not made public.)

To be in accordance with CAN-SPAM we agree that if at any time you would like to stop receiving future emails, you can email us at, and we will prevent users from sending you email messages.

Contacting Us

If there are any questions regarding this privacy policy you may contact us using the information below:

The OEIS Foundation Inc., 11 South Adelaide Avenue, Highland Park, NJ 08904, USA; email:

About this page

This page was created on December 08, 2015