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 A001151 Describe the previous term! (method A - initial term is 8). 17
 8, 18, 1118, 3118, 132118, 1113122118, 311311222118, 13211321322118, 1113122113121113222118, 31131122211311123113322118, 132113213221133112132123222118 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Method A = 'frequency' followed by 'digit'-indication. a(n+1) - a(n) is divisible by 10^5 for n > 5. - Altug Alkan, Dec 04 2015 REFERENCES S. R. Finch, Mathematical Constants, Cambridge, 2003, pp. 452-455. I. Vardi, Computational Recreations in Mathematica. Addison-Wesley, Redwood City, CA, 1991, p. 4. LINKS T. D. Noe, Table of n, a(n) for n=1..20 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, Conway's Constant [Broken link] EXAMPLE E.g. the term after 3118 is obtained by saying "one 3, two 1's, one 8", which gives 132118. MATHEMATICA RunLengthEncode[x_List] := (Through[{First, Length}[ #1]] &) /@ Split[x]; LookAndSay[n_, d_: 1] := NestList[Flatten[Reverse /@ RunLengthEncode[ # ]] &, {d}, n - 1]; F[n_] := LookAndSay[n, 8][[n]]; Table[FromDigits[F[n]], {n, 1, 11}] (* Zerinvary Lajos, Jul 08 2009 *) CROSSREFS Cf. A001155, A005150, A006751, A006715, A001140, A001141, A001143, A001145, A001154. Sequence in context: A215174 A171371 A092692 * A177367 A138492 A022512 Adjacent sequences:  A001148 A001149 A001150 * A001152 A001153 A001154 KEYWORD nonn,base,easy,nice AUTHOR STATUS approved

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Last modified February 18 13:07 EST 2018. Contains 299322 sequences. (Running on oeis4.)