Search: id:A006751
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%I A006751 M2052
%S A006751 2,12,1112,3112,132112,1113122112,311311222112,13211321322112,
%T A006751 1113122113121113222112,31131122211311123113322112,
%U A006751 132113213221133112132123222112
%N A006751 Describe the previous term! (method A - initial term is 2).
%C A006751 Method A = 'frequency' followed by 'digit'-indication.
%D A006751 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%D A006751 J. H. Conway, The weird and wonderful chemistry of audioactive decay, 
               in T. M. Cover and Gopinath, eds., Open Problems in Communication 
               and Computation, Springer, NY 1987, pp. 173-188.
%D A006751 S. R. Finch, Mathematical Constants, Cambridge, 2003, pp. 452-455.
%D A006751 I. Vardi, Computational Recreations in Mathematica. Addison-Wesley, Redwood 
               City, CA, 1991, p. 4.
%H A006751 S. R. Finch, <a href="http://algo.inria.fr/bsolve/constant/cnwy/cnwy.html">
               Conway's Constant</a>
%H A006751 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               LookandSaySequence.html">Link to a section of The World of Mathematics.</
               a>
%e A006751 E.g. the term after 3112 is obtained by saying "one 3, two 1's, one 2", 
               which gives 132112.
%t A006751 RunLengthEncode[ x_List ] := (Through[ {First, Length}[ #1 ] ] &) /@ 
               Split[ x ]; LookAndSay[ n_, d_:1 ] := NestList[ Flatten[ Reverse 
               /@ RunLengthEncode[ # ] ] &, {d}, n - 1 ]; F[ n_ ] := LookAndSay[ 
               n, 2 ][ [ n ] ]; Table[ FromDigits[ F[ n ] ], {n, 1, 11} ] - Zerinvary 
               Lajos (zerinvarylajos(AT)yahoo.com), Mar 21 2007
%Y A006751 Cf. A001155, A005150, A006715, A001140, A001141, A001143, A001145, A001151, 
               A001154.
%Y A006751 Sequence in context: A058975 A057120 A112512 this_sequence A023989 A001389 
               A022914
%Y A006751 Adjacent sequences: A006748 A006749 A006750 this_sequence A006752 A006753 
               A006754
%K A006751 nonn,base,easy,nice
%O A006751 1,1
%A A006751 N. J. A. Sloane (njas(AT)research.att.com).

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