The OEIS is supported by the many generous donors to the OEIS Foundation. Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A221372 A two-digit Look-and-Say sequence starting with 19: each term summarizes the increasing two-digit substrings of the previous term. 6
 19, 119, 111119, 411119, 311119141, 311114119131141191, 611113214219231241291, 311212113114119221123124129131132141142161191192, 911512313314116319521122123124129431132341142161291292 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 COMMENTS a(16) is the first term containing a zero; this is due to the fact that a(15) is the first term having exactly 10 occurrences of a two-digit number, namely 10 x 51. LINKS Reinhard Zumkeller, Table of n, a(n) for n = 0..1000 Eric Weisstein's World of Mathematics, Look and Say Sequence Wikipedia, Look-and-say sequence Reinhard Zumkeller, Haskell program for two-digit Look-and-Say sequences EXAMPLE a(0) = 19: 1 x 19 --> a(1) = 119; a(1) = 119: 1 x 11 and 1 x 19 --> a(2) = 111119; a(2) = 111119: 4 x 11 and 1 x 19 --> a(3) = 411119; a(3) = 411119: 3 x 11, 1 x 19 and 1 x 41 --> a(4) = 311119141. PROG (Haskell)  See Link. CROSSREFS Cf. A005151, A047842. Cf. A209234 (start=10), A209233 (start=11), A221368 (start=12), A221369 (start=13), A221373 (start=99). Sequence in context: A044351 A044732 A159851 * A252924 A157340 A252054 Adjacent sequences:  A221369 A221370 A221371 * A221373 A221374 A221375 KEYWORD nonn,base AUTHOR Reinhard Zumkeller, Jan 13 2013 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified October 1 23:23 EDT 2022. Contains 357173 sequences. (Running on oeis4.)