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Summary

DescriptionFirst six triangular numbers.svg
English: The first size triangular numbers: 1, 3, 6, 10, 15, and 21.
Date
Source Own work
Author Melchoir

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9 October 2011

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Date/TimeThumbnailDimensionsUserComment
current04:32, 10 October 2011 Thumbnail for version as of 04:32, 10 October 2011 374 ×ばつ 314 (42 KB)Melchoir

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