A213979 - OEIS

%I #14 Jun 28 2026 15:48:06

%S 1112,1112133,111213322112,111213322113,1113,11131,111311222112,

%T 111312,11131221,1113122112,1113122113,11131221131112,111312211312,

%U 11131221131211,111312211312113211,111312211312113221133211322112211213322112

%N Conway's 92 Look and Say audioactive elements, generated in lexicographic order.

%D 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.

%H Reinhard Zumkeller, <a href="/A213979/b213979.txt">Table of n, a(n) for n = 1..92</a>

%H Kevin Watkins, <a href="http://www.cs.cmu.edu/~kw/pubs/conway.pdf">Abstract Interpretation Using Laziness: Proving Conway's Lost Cosmological Theorem</a>

%H Kevin Watkins, <a href="http://www.cs.cmu.edu/~kw/pubs/conwayslides.pdf">Proving Conway's Lost Cosmological Theorem, POP seminar talk, CMU, Dec 2006</a>

%H Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/LookandSaySequence.html">Look and Say Sequence</a>

%H Wikipedia, <a href="https://en.wikipedia.org/wiki/Look-and-say_sequence">Look-and-say sequence</a>

%H Reinhard Zumkeller, <a href="/A213979/a213979.hs.txt">Haskell programs for Look and Say audioactive elements</a>

%o (Haskell)  see Haskell link.

%Y Cf. A119566, A215403.

%K nonn,fini,base

%O 1,1

%A _Reinhard Zumkeller_, Aug 09 2012