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A001155
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Describe the previous term! (method A - initial term is 0).
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13
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0, 10, 1110, 3110, 132110, 1113122110, 311311222110, 13211321322110, 1113122113121113222110, 31131122211311123113322110, 132113213221133112132123222110
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| Method A = 'frequency' followed by 'digit'-indication.
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REFERENCES
| 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.
S. R. Finch, Mathematical Constants, Cambridge, 2003, pp. 452-455.
I. Vardi, Computational Recreations in Mathematica. Addison-Wesley, Redwood City, CA, 1991, p. 4.
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LINKS
| T. D. Noe, Table of n, a(n) for n=1..20
S. R. Finch, Conway's Constant
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EXAMPLE
| E.g. the term after 3110 is obtained by saying "one 3, two 1's, one 0", which gives 132110.
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PROG
| (PARI) A001155(n, a=0)={ while(n--, my(c=1); for(j=2, #a=Vec(Str(a)), if( a[j-1]==a[j], a[j-1]=""; c++, a[j-1]=Str(c, a[j-1]); c=1)); a[#a]=Str(c, a[#a]); a=concat(a)); a } \\ - M. F. Hasler, Jun 30 2011
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CROSSREFS
| Cf. A005150, A006751, A006715, A001140, A001141, A001143, A001145, A001151, A001154.
Cf. A036058.
Sequence in context: A138147 A204577 A036058 * A001391 A049064 A015026
Adjacent sequences: A001152 A001153 A001154 * A001156 A001157 A001158
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KEYWORD
| nonn,base,easy,nice
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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