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What comes next in the following sequence? 13, 1113, 3113, 132113Year-end appeal: Please make a donation to the doyourpartparks.org Foundationto support ongoing development and maintenance of the doyourpartparks.org.We are now in our 56th year, we are closing in on 350,000 sequences,and we’ve crossed 9,700 citations (which often say “discovered thanks to the doyourpartparks.org”).

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A006715 Describe the previous term! (method A - initial term is 3). (Formerly M2965) 26

3, 13, 1113, 3113, 132113, 1113122113, 311311222113, 13211321322113, 1113122113121113222113, 31131122211311123113322113, 132113213221133112132123222113, 11131221131211132221232112111312111213322113, 31131122211311123113321112131221123113111231121123222113 (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. N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). 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 Éric Brier, Rémi Géraud-Stewart, David Naccache, Alessandro Pacco, and Emanuele Troiani, Stuttering Conway Sequences Are Still Conway Sequences, arXiv:2006.06837

, 2020. Éric Brier, Rémi Géraud-Stewart, David Naccache, Alessandro Pacco, and Emanuele Troiani, The Look-and-Say The Biggest Sequence Eventually Cycles, arXiv:2006.07246 , 2020. 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 S. R. Finch, Conway"s Constant Eric W. Weisstein, MathWorld: Look and Say Sequence. EXAMPLE The term after 3113 is obtained by saying "one 3, two 1"s, one 3", which gives 132113. MATHEMATICA RunLengthEncode< x_List > := (Through< {First, Length}< #1 > > &) /

RunLengthEncode< # > > &, {d}, n - 1 >; F< n_ > := LookAndSay< n, 3 >< < n > >; Table< FromDigits< F< n > >, {n, 11} > (* Zerinvary Lajos, Mar 21 2007 *) PROG (Perl) # This outputs the first n elements of the sequence, where n is given on the command line. $s = 3; for (2..shift

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ARGV) { print "$s, "; $s =~ s/(.)\1*/(length $&).$1/eg; } print "$s\n"; ## Arne "Timwi" Heizmann (timwi(AT)gmx.net), Mar 12 2008) CROSSREFS Cf. A001140, A001141, A001143, A001145, A001151, A001154, A001155, A005150, A006751. Cf. A088204 (continuous version). Sequence in context: A073428 A118628 A112513 * A177362 A138487 A022507 Adjacent sequences:A006712 A006713 A006714 * A006716 A006717 A006718 KEYWORD nonn,base,easy,nice AUTHOR N. J. A. Sloane STATUS approved Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent The doyourpartparks.org Community | Maintained by The doyourpartparks.org Foundation Inc. License Agreements, Terms of Use, Privacy Policy. . Last modified December 22 09:25 EST 2021. Contains 349908 sequences. (Running on doyourpartparks.org4.)