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            This is a file from the  Wikimedia Commons. Information from its  description page there is shown below.  Commons is a freely licensed media file repository.  You can help. 
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           | Description | 
           200×200 Ulam spiral. | 
          
          
           | Date | 
           1 November 2006 | 
          
          
           | Source | 
           Originally from  en.wikipedia; description page is/was  here. | 
          
          
           | Author | 
           Original uploader was  Grontesca at  en.wikipedia 
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           Permission ( Reusing this file) | 
           
             Licensed under the  GFDL by the author; Released under the  GNU Free Documentation License. 
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         Licensing 
        
         
          
            Grontesca at the  English language Wikipedia, the copyright holder of this work, hereby publishes it under the following license:
           
            
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             Permission is granted to copy, distribute and/or modify this document under the terms of the  GNU Free Documentation License, Version 1.2 or any later version published by the  Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled  GNU Free Documentation License.  http://www.gnu.org/copyleft/fdl.htmlGFDLGNU Free Documentation Licensetruetrue 
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       File usage
       
        The following pages on Schools Wikipedia link to this image (list may be incomplete):
        
        
       
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