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

 

Logo

Annual Appeal: Please make a donation (tax deductible in USA) to keep the OEIS running. Over 5000 articles have referenced us, often saying "we discovered this result with the help of the OEIS".

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A121264 See Comments for definition. 5
2, 3, 5, 26, 1370, 9840770, 851566070376026 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

We use N_b to denote "N read in base b". Similar to A121263, but now we write the numerals in the stack in binary:

......10....10.....10......10........etc.

..............11.....11......11..........

.......................100.....100.......

..................................101....

The next two terms have about 144 and 450 digits respectively.

A "dungeon" of numbers.

REFERENCES

David Applegate, Marc LeBrun and N. J. A. Sloane, Descending Dungeons, Problem 11286, Amer. Math. Monthly, 116 (2009) 466-467.

David Applegate, Marc LeBrun and N. J. A. Sloane, Descending Dungeons and Iterated Base-Changing, in "The Mathematics of Preference, Choice and Order: Essays in Honor of Peter Fishburn", edited by Steven Brams, William V. Gehrlein and Fred S. Roberts, Springer, 2009, pp. 393-402.

LINKS

Table of n, a(n) for n=1..7.

David Applegate, Marc LeBrun and N. J. A. Sloane, Descending Dungeons and Iterated Base-Changing (arXiv:math.NT/0611293).

CROSSREFS

Cf. A121263, A121265.

Sequence in context: A024774 A068543 A064026 * A141566 A247094 A078736

Adjacent sequences:  A121261 A121262 A121263 * A121265 A121266 A121267

KEYWORD

nonn,base

AUTHOR

Marc LeBrun, Aug 23 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 December 3 04:39 EST 2016. Contains 278698 sequences.