OFFSET: 1,2; COMMENTS: Necklaces with n beads that are the same when turned over. The subset {a(1), ,a(2k)} contains all proper divisors of 3*2^k. - Ralf Stephan Adjacent sequences: A048739 A048740 A048741 * A048743 A048744 A048745; KEYWORD: nonn; AUTHOR: Content is available under The OEIS End-User License Agreement . Mar 29, 2012 This site is supported by donations to The OEIS Foundation. For further information see the main Index to OEIS page. Please read Index: