Search: id:A002075
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%I A002075 M1160 N0443
%S A002075 1,1,2,4,8,22,52,140,366,992,2684,7404,20440,56992,159440,448540,
%T A002075 1266080,3587610,10195276,29057520,83018728,237737984,682196948,
%U A002075 1961323740,5648590728,16294032160,47071589778,136171440600
%N A002075 Number of equivalence classes with primitive period n of base 3 necklaces, 
               where necklaces are equivalent under rotation and permutation of 
               symbols.
%D A002075 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%D A002075 N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 
               (includes this sequence).
%D A002075 N. J. Fine, Classes of periodic sequences, Illinois J. Math., 2 (1958), 
               285-302.
%H A002075 <a href="Sindx_Ne.html#necklaces">Index entries for sequences related 
               to necklaces</a>
%F A002075 Reference gives formula.
%F A002075 Reference gives formula. Sequence A002076 can be found by the following: 
               Let F3(n) = this sequence, F3*(n) = function from A002076. Then F3*(n) 
               = Sum_{ d divides n } F3(d).
%Y A002075 Cf. A000013, A000048, A002076.
%Y A002075 Sequence in context: A155765 A027385 A158324 this_sequence A122623 A124014 
               A100827
%Y A002075 Adjacent sequences: A002072 A002073 A002074 this_sequence A002076 A002077 
               A002078
%K A002075 nonn,easy,nice
%O A002075 1,3
%A A002075 N. J. A. Sloane (njas(AT)research.att.com).
%E A002075 Better description and more terms from Mark Weston (mweston(AT)uvic.ca), 
               Oct 07 2001

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