Sum of Consecutive Triangular Numbers is Square/Visual Demonstration
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Theorem
The sum of two consecutive triangular numbers is a square number.
Visual Demonstration
$\blacksquare$
Sources
- 1986: David Wells: Curious and Interesting Numbers ... (previous) ... (next): $25$
- 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $25$