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Square Pyramidal Numbers Puzzle Manipulative – 3D printable model from Thingiverse Thingiverse
Square Pyramidal Numbers Puzzle Manipulative – Bild 1 Square Pyramidal Numbers Puzzle Manipulative – Bild 2 Square Pyramidal Numbers Puzzle Manipulative – Bild 3 Square Pyramidal Numbers Puzzle Manipulative – Bild 4 Square Pyramidal Numbers Puzzle Manipulative – Bild 5 Square Pyramidal Numbers Puzzle Manipulative – Bild 6
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Square Pyramidal Numbers Puzzle Manipulative

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The [square pyramidal numbers](http://en.wikipedia.org/wiki/Square_pyramidal_number) are the sums of the first n squares: 1^2 + 2^2 + ... + n^2 = n (n+1)(2n+1)/6. This puzzle illustrates a nice geometric proof of this sum formula. The original sum is represented by a step pyramid where the (square) levels contain 1^2, 2^2, 3^2, ... , 5^2 blocks. The challenge is to assemble six of these pyramids into a 5 x 6 x 11 box.
Category
Learning
Source
Thingiverse
Published
What you need to print this: Beginner Low confidence
Single piece
Supports 1/3
Assembly 0/3
Settings 1/3
Bed size 0/3
Post-process 0/3
Printer
FDM / FFF
File format
STL
Material
Software
Cura, PrusaSlicer, or similar
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