|   | 1 |  initial version  | 
Note that in your example i have:
sage: H.cardinality()
216
|   | 2 |  No.2 Revision  | 
Note that in your example i have:
sage: H.cardinality()
216
Do you know by other means that H is isomorphic to Z/27Z ? Something might be buggy in Sage.
 Copyright Sage, 2010. Some rights reserved under creative commons license. Content on this site is licensed under a Creative Commons Attribution Share Alike 3.0 license.
 
                
                Copyright Sage, 2010. Some rights reserved under creative commons license. Content on this site is licensed under a Creative Commons Attribution Share Alike 3.0 license.