~ Early Web Links ~

The OEIS is a massive searchable database of over 393,000 integer sequences, maintained by the OEIS Foundation and originally created by mathematician Neil Sloane. Researchers, students, and math enthusiasts can look up sequences by entering numbers to identify patterns, explore combinatorics, and discover connections across mathematical disciplines.

The North Suburban Math League (NSML) organizes competitive math meets for Chicago-area high schools, with five competitions held throughout the school year. The site provides contest archives, meet schedules, written and oral topic lists, coach resources, and a history of NSML alumni who have earned medals at the International Mathematical Olympiad.

The National Curve Bank is a mathematical archive dedicated to cataloging and exploring curves, offering detailed information on their properties, equations, and historical significance. A sister site to the Witch of Agnesi page, this project serves as an educational reference for students, educators, and math enthusiasts interested in the geometry of curves.

Created by Alexander Bogomolny starting in 1996, Cut the Knot is a massive encyclopedic collection of interactive mathematics covering geometry, algebra, probability, puzzles, proofs, and much more, built over decades until his passing in 2018. With thousands of pages, interactive Java applets, Olympiad problems, and articles spanning all levels of math, it stands as one of the most beloved and comprehensive math resources ever built on the early web.

Created by Hiroshi Kotera, this site documents Sangaku, the beautiful geometric theorems that Japanese scholars of all social classes inscribed on wooden tablets and dedicated to shrines and temples during the Edo period. It offers images of surviving Sangaku tablets and serves as a rare English-language window into this uniquely Japanese mathematical tradition dating back to 1996.

Christian Plesner Hansen's technical blog dives deep into the legendary fast inverse square root hack and its magic constant 0x5f3759df, tracing the algorithm's surprising history from Ardent Computer in the 1980s through SGI, 3dfx, and Quake III Arena. The post rigorously explains the underlying floating-point bit manipulation, generalizes the technique to arbitrary powers, and includes graphs and mathematical derivations that illuminate why this 'evil' hack actually works.

Mathematrix, created by Lee Stemkoski at Adelphi University, explores the playful and lesser-known side of mathematics through topics like polyominoes, Rubik's Cube, fractals, Conway's Game of Life, and higher dimensions. Accessible to curious minds at any level, the site blends mathematical art, humor, poetry, and hands-on puzzles to make recreational math genuinely entertaining.

Hosted by Agnes Scott College, this site offers an extensive collection of biographical essays on women mathematicians throughout history, organized alphabetically, chronologically, and even by birthplace with an interactive Google Map. It also tracks prizes, firsts, and current achievements, making it a rich reference for anyone interested in the history of women in mathematics.

Bruno Kevius has assembled an extensive link collection covering mathematical art, fractals, chaos theory, and geometry, featuring resources on M.C. Escher, polyhedra, cellular automata, and fractal software. With over 120 curated links spanning strange attractors, tessellations, origami, and geometric sculpture, this is a rich reference hub for anyone exploring the intersection of math and visual art.