login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A110393 Modified Look-and-Say sequence where 2 is the largest number that may be used. 1
1, 11, 21, 1211, 111221, 21112211, 1221112221, 11222111221211, 212212211122111221, 121122112221112221112211, 111221222122122111221221112221, 2111221122121122112221112211222111221211 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

The ratio r(n) of the number of "1"s to the number of "2"s in the sequence converges to (4*phi^(3/2)+5*phi+sqrt(phi)+3) / (4*phi^(3/2)+5*phi+3*sqrt(phi)+3) = 0.890054... as n goes to infinity, where phi = (1+sqrt(5))/2 is the golden ratio. [From Nathaniel Johnston, Jan 13 2011]

LINKS

Table of n, a(n) for n=0..11.

N. Johnston, Further Variants of the "Look-and-Say" Sequence

CROSSREFS

Cf. A005150, A179999.

Sequence in context: A063850 A005150 A001388 * A202627 A257491 A169853

Adjacent sequences:  A110390 A110391 A110392 * A110394 A110395 A110396

KEYWORD

base,easy,nice,nonn

AUTHOR

Levi Kryder (seelevrun(AT)hotmail.com), May 11 2006

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 | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified June 28 14:30 EDT 2017. Contains 288838 sequences.