Sum of Triangular Numbers II (visual proof via cannonballs) Published 2023-01-03 Download video MP4 360p Recommendations 01:36 A Multiplicative Triangular Number Recurrence (visual proof) 08:03 What if light was really slow? 12:54 Every Unsolved Math problem that sounds Easy 02:16 Perfect Numbers (even ones) are Triangular (visual proof) -- with bonus open problem! 02:17 3D Sum of Triangular Numbers (visual proof without words III) 06:33 The Secret Music of Pascal's Triangle 02:13 Sum of Triangular Numbers I (visual proof) 02:51 Sum of First n Cubes (Algebraic and Visual Proof) 08:14 The Mathematical Danger of Democratic Voting 05:59 Root 2 is Irrational from Isosceles Triangle (visual proof) 11:14 The Man Who Solved the World’s Hardest Math Problem 03:30 Animating Nicomachus's 2000 year old mathematical gem (Mathologer Christmas video) 13:41 Every Unsolved Math Problem Solved 05:26 A Factorial Sum Produces the Factorial Number System (visual proof) 05:19 Six, Five, and Four Segment Displays 04:14 Three Geometric Series in an Equilateral Triangle (visual proof without words) 10:56 The Humanly Infinite 12:59 The Boundary of Computation 09:13 The "Just One More" Paradox 15:44 And this year's Turing Award goes to... Similar videos 01:17 Alternating Sum of Triangular Numbers (visual proof without words) 03:13 Infinite series: summing reciprocals of triangular numbers (visual proof) 01:33 Products of Odd Squares and Triangular Numbers (visual proof - updated version) 03:27 The cannonball problem 00:16 Don't Do This At Home 00:12 Geometric Proof of the Tetrahedral Number Formula 02:03 Sum of Cubes IV (Nicomachus's Theorem) 03:59 Counting Cannonballs 00:44 Simple Geometric Proof of Triangular Number Formula 00:31 Visual Proof VII 00:59 Tetrahedral Numbers 19:04 (NT05) Triangular & Tetrahedral Numbers 02:47 Number Theory || Nicomachus's Theorem || Visualization 5:22:14 The Complete History of the A Button Challenge 4:51:33 A Name Is Earned | Critical Role: VOX MACHINA | Episode 49 More results