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There exist triangular numbers that are also square

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Visit this site: http://www.cut-the-knot.org/do_you_know/triSquare.html
Author:Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
Description: Inspired by a message sent in by Chris Whitrow, this page enumerates the set of infinite numbers that are concurrently triangular and square, and defines a recurrence relation for generating them.
Levels: High School (9-12), Early College
Languages: English
Math Topics: Sequences and Sets

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