—SEC. 05 — Open Problems
Open Problems
— SEC. 01
Subcategories
Subcategories
Browse by subcategory.
— SEC. 02
Listings
Listings
All links in this category.
Showing 1–5 of 5 editor-approved links.
Open_Problems
Unsolved Problems in Number Theory, Logic and Cryptography
unsolvedproblems.org
Unsolved Problems in Number Theory, Logic and Cryptography, with references for further reading.
Added May 10, 2026
ABC_Conjecture
The ABC Conjecture
www.math.unicaen.fr
Maintained by Abderrahmane Nitaj.
Added May 10, 2026
Catalan_Conjecture
Wikipedia: Catalan's Conjecture
en.wikipedia.org
Brief article offers a description of the problem and features links.
Added May 10, 2026
Goldbach_Conjecture
Mathematical Mysteries
pass.maths.org
A brief popular article with an applet generating solutions.
Added May 10, 2026
Lychrel_Numbers
Lychrel Number
mathworld.wolfram.com
MathWorld article and resources.
Added May 10, 2026