%I A023989
%S A023989 2,12,1112,3112,211213,312213,212223,114213,31121314,41122314,31221324,
%T A023989 21322314,21322314,21322314,21322314,21322314,21322314,21322314,21322314,
%U A023989 21322314,21322314,21322314,21322314,21322314,21322314,21322314,21322314
%N A023989 Look and Say sequence: describe the previous term! (method C - initial 
               term is 2).
%C A023989 Method C = 'frequency' followed by 'digit'-indication with digits in 
               increasing order.
%C A023989 Converges to 21322314 at the eleventh term. Depending on the initial 
               value, the sequence may converge to a cycle of 2 or more values, 
               for example : 123456, 111213141516, 711213141516, 611213141516, 611213141526, 
               512213141526, 413213142516, 412223241516, 314213241516, 412223241516, 
               314213241516, 412223241516
%e A023989 a(1) = 12, so a(2) = 1112 because 12 contains a digit 1 and a digit 2; 
               a(3) = 3112 because 1112 contains three digits 1 and a digit 2
%Y A023989 Cf. A005150, A022481.
%Y A023989 Sequence in context: A057120 A112512 A006751 this_sequence A001389 A022914 
               A138486
%Y A023989 Adjacent sequences: A023986 A023987 A023988 this_sequence A023990 A023991 
               A023992
%K A023989 nonn,base
%O A023989 0,1
%A A023989 Artemario Tadeu Medeiros da Silva (artemario(AT)uol.com.br), Mar 19 2002