There is a Purdue web page where enormous unfinished integer factorizations are still maintained like an active wanted board.
The Cunningham Project is devoted to factoring numbers of the form b^n ± 1 for bases 2, 3, 5, 6, 7, 10, 11 and 12. That sounds narrow until you open the tables and discover how quickly “narrow” turns into thousands of giant integers, partial factors, composite cofactors and unfinished business.
The project is associated with the Cunningham tables published in Factorizations of b^n ± 1, by John Brillhart, D. H. Lehmer, J. L. Selfridge, Bryant Tuckerman and S. S. Wagstaff Jr. The first two editions existed as paper books. The third edition, published in 2002, became an electronic book with machine-readable tables.
That transition is visible in the surviving site. The front page is mostly links and text files. There is no app pretending to be a document. If you want the main tables, you get the tables.
A mathematical job board
One of the best surviving pieces is the project’s “wanted” list. It names composite cofactors still worth attacking, including entries hundreds of digits long. The notation is terse because the intended readers already know what they are looking at.
The main tables are much larger. A table for factors of 2^n - 1, for example, marches through exponent after exponent with known prime factors and unresolved pieces. Some rows collapse neatly. Others end with labels such as P57 or larger unresolved cofactors.
The home page was still being updated in January 2026. It links to current wanted lists, champion results, the latest main tables, appendices, old pages and a page showing who is factoring which number.
That last link says a lot about the culture behind the project. This is not a frozen exhibit. It is a long-running cooperative calculation problem that happened to acquire a Web front end.
For modern webmasters, the page is also a useful reminder that a specialized site does not need much machinery when the information itself is the product. Plain links, plain text, durable filenames and stable URLs have kept a highly technical research resource usable for years.
The Cunningham Project is not visually impressive. It does not need to be. The interesting part is that a mathematical effort old enough to have originated in printed tables is still being extended through one of the simplest interfaces the Web can provide.