login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A123727 An example of a stereogram: a flat picture that appears three-dimensional when viewed in the correct way. 1
1, 111, 1, 111, 11211, 111, 1, 111, 11211, 1123211, 11211, 111, 1, 111, 11211, 1123211, 112343211, 1123211, 11211, 111, 1 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

What happens after 9? - N. J. A. Sloane, Nov 18 2006

Three-dimensionally it looks like this:

...000000000000000000000000000000010000000000000000000000000000000000...

...000000000000000000000000000000111000000000000000000000000000000000...

...000000000000000000000000000000010000000000000000000000000000000000...

...000000000000000000000000000000111000000000000000000000000000000000...

...000000000000000000000000000001121100000000000000000000000000000000...

...000000000000000000000000000000111000000000000000000000000000000000...

...000000000000000000000000000000010000000000000000000000000000000000...

...000000000000000000000000000000111000000000000000000000000000000000...

...000000000000000000000000000001121100000000000000000000000000000000...

...000000000000000000000000000011232110000000000000000000000000000000...

...000000000000000000000000000001121100000000000000000000000000000000...

...000000000000000000000000000000111000000000000000000000000000000000...

...000000000000000000000000000000010000000000000000000000000000000000...

...000000000000000000000000000000111000000000000000000000000000000000...

...000000000000000000000000000001121100000000000000000000000000000000...

...000000000000000000000000000011232110000000000000000000000000000000...

...000000000000000000000000000112343211000000000000000000000000000000...

...000000000000000000000000000011232110000000000000000000000000000000...

...000000000000000000000000000001121100000000000000000000000000000000...

...000000000000000000000000000000111000000000000000000000000000000000...

...000000000000000000000000000000010000000000000000000000000000000000...

...000000000000000000000000000000111000000000000000000000000000000000...

...000000000000000000000000000001121100000000000000000000000000000000...

...000000000000000000000000000011232110000000000000000000000000000000...

...000000000000000000000000000112343211000000000000000000000000000000...

...000000000000000000000000001123454321100000000000000000000000000000...

...000000000000000000000000000112343211000000000000000000000000000000...

...000000000000000000000000000011232110000000000000000000000000000000...

...000000000000000000000000000001121100000000000000000000000000000000...

...000000000000000000000000000000111000000000000000000000000000000000...

...000000000000000000000000000000010000000000000000000000000000000000...

REFERENCES

C. Ashbacher, Smarandache Sequences, Stereograms and Series, Phoenix, 2005, pp. 70-71.

F. Smarandache, Sequences of Numbers Involved in Unsolved Problems, Hexis, Phoenix, 2006.

LINKS

Table of n, a(n) for n=1..21.

C. Ashbacher, Smarandache Sequences, Stereograms and Series.

F. Smarandache, Sequences of Numbers Involved in Unsolved Problems.

CROSSREFS

Cf. A123698.

Sequence in context: A266435 A216479 A123698 * A282915 A279800 A282360

Adjacent sequences:  A123724 A123725 A123726 * A123728 A123729 A123730

KEYWORD

nonn

AUTHOR

Z. Wenpeng (wpzhang(AT)nwu.edu.cn), Nov 18 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
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified August 14 07:04 EDT 2020. Contains 336477 sequences. (Running on oeis4.)