Recreations
- 221
- Fibonacci and Lucas Numbers
- Electrical equivalence of discrete lumped cascaded T sections with the infinitesimal transmission line of distributed elements and with the Fibonacci and Lucas Numbers of 2n.
- 223
- 666 archive of gleanings
- A little archive of gleanings, theories and links relating to the most misunderstood number of all.
- 224
- Curious properties of 153
- Number 153 can be found in the New Testament, where in the net Simon Peter drew from the Sea of Tiberias held 153 fishes. Interesting properties of number 153 are given here.
- 229
- The 47 Society
- An international interest-group that follows the occurrence and recurrence of the quintessential random number: 47. Many suspect that the quintessential nature of 47 carries some mystical, metaphysical and/or scientific significance.
- 230
- Crazy for Math Online Contest
- An annual online contest for children to share ideas on how they use math in activities with their families.
- 231
- MATHmodels
- An online team competition where students compete to solve real-life problems using mathematical modeling.
- 232
- Mathematical Contest in Modeling (COMAP)
- Annual online competition for teams of undergraduates to use mathematical modeling to solve real world problems. Includes information about registration and an archive of past contest questions.
- 233
- Online Math Madness
- Browser based mathematics competition for students to gain problem solving experience.
- 234
- USA Mathematical Talent Search (USAMTS)
- A free mathematics competition available to all high school students in the United States. Interested participants may enter the competition at any time of the academic year.
- 235
- Greg Martin (UBC)
- Syllabus and practice problems from Rajiv Gupta and Greg Martin's Putnam practice sessions.
- 236
- Mathematics Olympiad Lecture Notes
- By Greg Gamble for highschool students intending to participate in Mathematics Olympiads.
- 237
- Problem Solving References & Resources
- Overview of seminars oriented towards problem solving. Includes sample problem sets, list of online resources, college mathematics journals, and useful books. Maintained by Andrew Bernoff (Harvey Mudd College).
- 238
- Ravi Vakil (Stanford)
- Training resources for the Putnam competition. Practice problems, notes on mathematical theories, and recommended reading.