This simple image could be re-created using vector graphics as an SVG file. This has several advantages; see Commons:Media for cleanup for more information. If an SVG form of this image is available, please upload it and afterwards replace this template with {{vector version available|new image name}}. It is recommended to name the SVG file “Triangular number 15.svg”—then the template Vector version available (or Vva) does not need the new image name parameter.

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15 as a triangular number. Created by User:Fredrik.

Part of the series:

• Image:Triangular number 1.png
• Image:Triangular number 3.png
• Image:Triangular number 6.png
• Image:Triangular number 10.png
• Image:Triangular number 15.png
• Image:Triangular number 21.png

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Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version.

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• (del) (cur) 00:06, 2 December 2004 . . en:User:Fredrik Fredrik ( en:User_talk:Fredrik Talk) . . 232x80 (362 bytes) (description to be added)