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.

Transferred from en.wikipedia to Commons by Maksim.

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

I, the copyright holder of this work, release this work into the public domain. This applies worldwide. In some countries this may not be legally possible; if so: I grant anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.

Original upload log

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

Click on date to download the file or see the image uploaded on that date.

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