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A092400 Fixed point of the morphism 1 -> 1121211, 2 -> 1121212121211, starting from a(1) = 1. 1
1, 1, 2, 1, 2, 1, 1, 1, 1, 2, 1, 2, 1, 1, 1, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 1, 1, 1, 2, 1, 2, 1, 1, 1, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 1, 1, 1, 2, 1, 2, 1, 1, 1, 1, 2, 1, 2, 1, 1, 1, 1, 2, 1, 2, 1, 1, 1, 1, 2, 1, 2, 1, 1, 1, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 1, 1, 1, 2, 1, 2, 1, 1, 1, 1, 2, 1, 2, 1, 2, 1, 2, 1 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Length of n-th run of identical symbols in A051069.

LINKS

Table of n, a(n) for n=1..105.

Index entries for sequences that are fixed points of mappings

FORMULA

Sum_{k=1..n} a(k) = A007417(n).

MATHEMATICA

Nest[ Function[ l, {Flatten[(l /. {1 -> {1, 1, 2, 1, 2, 1, 1}, 2 -> {1, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 1}})]}], {1}, 3] (* Robert G. Wilson v, Feb 26 2005 *)

CROSSREFS

Cf. A007417, A051069.

Sequence in context: A184240 A244840 A103414 * A303598 A337277 A269974

Adjacent sequences:  A092397 A092398 A092399 * A092401 A092402 A092403

KEYWORD

easy,nonn

AUTHOR

Philippe Deléham, Mar 21 2004

EXTENSIONS

More terms from Robert G. Wilson v, Feb 26 2005

STATUS

approved

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Last modified December 2 09:52 EST 2020. Contains 338876 sequences. (Running on oeis4.)