Pyramid_of_35_spheres_animation.gif(160 × 120 pixels, file size: 189 KB, MIME type: image/gif, looped, 24 frames, 1.2s)

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  • Tetrahedral number

    A tetrahedral number, or triangular pyramidal number, or Digonal Deltahedral number is a...

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current05:01, January 19, 2013Thumbnail for version as of 05:01, January 19, 2013160 × 120 (189 KB)Jiawheinalt (Talk | contribs)

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