Keywords: A 150x150 Ulam spiral of dots with varying widths.svg This is an Ulam spiral of 150 x 150 dots with differing widths It's a copy of File Spirale_Ulam_150 jpg only in SVG format https //commons wikimedia org/wiki/File Spirale_Ulam_150 jpg 2013-10-13 Cortexd https //commons wikimedia org/wiki/File Spirale_Ulam_150 jpg Cortexd Original upload log en wikipedia A+150x150+Ulam+spiral+of+dots+with+varying+widths svg wikitable - 2013-10-13 21 22 912×912× 2056931 bytes Toon81 <nowiki>Uploading a file from a free published source using File Upload Wizard</nowiki> Ulam spiral |