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CenteredTriangularNumber19.png(200 × 177 pixels, file size: 15 KB, MIME type: image/png)

Centered triangular number 19

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current14:18, 25 July 2010Thumbnail for version as of 14:18, 25 July 2010200 × 177 (15 KB)Peter Luschny (talk | contribs)Centered triangular number 19
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