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CenteredPentagonalNumber31.png(200 × 189 pixels, file size: 18 KB, MIME type: image/png)

Centered pentagonal number 31

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current14:13, 25 July 2010Thumbnail for version as of 14:13, 25 July 2010200 × 189 (18 KB)Peter Luschny (talk | contribs)Centered pentagonal number 31
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