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 A098820 Periodicity of entries in the first row of a Laver Table of size 2^n. 0
 1, 1, 2, 4, 4, 8, 8, 8, 8, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 COMMENTS All sequence elements are powers of 2. The first n for which a(n)=32 is at least A(9,A(8,A(8,255))), where A denotes the Ackermann function (R. Dougherty). If a rank-into-rank exists, then the sequence is diverging (R. Laver). LINKS Richard Laver, On the Algebra of Elementary Embeddings of a Rank into Itself, Advances in Mathematics 110, p. 334, 1995 Wikipedia, Laver table EXAMPLE a(4)=4 because the entries in the first row of the Laver table of size 4^2=16 are 2,12,14,16,2,12,14,16,2,12,14,16,2,12,14,16 (and thus repeat with a periodicity of 4). CROSSREFS Sequence in context: A265560 A265544 A290221 * A296613 A062383 A034583 Adjacent sequences:  A098817 A098818 A098819 * A098821 A098822 A098823 KEYWORD nonn AUTHOR Christian Schroeder, Oct 08 2004 EXTENSIONS More terms from Adam P. Goucher, Dec 18 2013 STATUS approved

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Last modified October 18 10:46 EDT 2019. Contains 328147 sequences. (Running on oeis4.)