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This video explains what triangular numbers are and the patterns associated with them. Two puzzles are at the end of the video ...

This video explains how to find the nth triangular number. For a refresher on triangular numbers see our video: https://youtu ...

This is a short, animated visual proof showing how to find the sum of the first n triangular numbers (which themselves are sums of ...

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We present an animation of a visual proof demonstrating how to visualize the the congruence classes of triangular numbers ...

Are you ready to dive into the mesmerizing world of triangular numbers? 🌟 Let's begin our journey of solving the mystery of ...

Triangular Numbers - This video covers the concept of figurate numbers, and derives the expression used for triangular number.

Corbettmaths - This video explains what triangular numbers are and how to find them.

A simple visualization of the standard trick to calculate the n-th triangular number 1+2+3+...+n.

This is a short, animated visual proof demonstrating how to visualize odd squares as the difference of two triangular numbers.

Triangular numbers and Gauss' trick for adding numbers between 1 and n.

This is a short, animated visual proof showing that all even perfect numbers are triangular numbers (and thus all currently known ...

For a refresher on triangular numbers see our video: https://youtu.be/3G0VozmToZ4 Skip to: 00:00 Introduction 00:28 How to find ...

This video explains what triangular numbers are and the patterns associated with them. Two puzzles are at the end of the video.

This is a short, animated visual proof computing the sum of the series obtained by adding reciprocals of the triangular numbers.

This is a short, animated visual proof showing how a formula for the sum of the first n triangular numbers (which themselves are ...