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journal article 85.25 Square-Triangular Numbers, Revisited Peter A. Braza and Jingcheng Tong The Mathematical Gazette , pp. 270-273 (4 pages) ...
87.55 An Elementary Approach to Finding All Square-Triangular Numbers Jingcheng Tong and Peter A. Braza The Mathematical Gazette , pp. 494-496 (3 pages) ...
Learn about how triangle sequences, quadratic sequences and the common difference with this BBC Bitesize Maths article. For students between the ages of 11 and 14.