UNSOLVED PROBLEMS

In Number Theory, Logic, and Cryptography

What’s New

 

This page lists recent changes to the web-site. If you intend to be a regular user of the site, you might like to bookmark this page so that you can see at a glance what has changed since your last visit.

 

June 2010:  The ABC conjecture and the problem of finding a four-dimensional Euler Brick (or proving its non-existence) have been added to the web site.

May 2010:  I believe it is now beyond reasonable doubt that the solution to the Dorabella Cipher presented as item #12 on the Solutions page is the correct decipherment.  This makes it the only problem on this site to have been solved thus far.

December 2009: The Legendre Conjecture has been removed, and Fermat’s Last Theorem added.

April 2009: More proposed solutions have been added to the solutions page.

March 2009: A proposed disproof of the existence of an odd perfect number has been added.

January 2009: A proposed solution to the Goldbach Conjecture, and a proposed disproof of the existence of an Euler Brick, and a revamp of the web-site.

January 2008: A contribution to the Odd Perfect Number problem.

June 2007: The Zodiac killer's 340 cipher has been added to the web site.

May 2007: Two proposed proofs of the Riemann Hypothesis have been added to the Solutions page. Also a proposed solution to the Dorabella Cipher.

February 2007: The Euler Brick problem and the Legendre Conjecture have been added.

January 2007: Several typos have been corrected. The existence of the site has been announced on a few relevant newsgroups. The Square of Squares problem has been clarified.

December 2006: The whole site is new! Please read the Introduction, and check out the FAQ.

 

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This web site developed and maintained by

Tim S Roberts

Email: timro21@gmail.com