This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A121864 See Comments lines for definition. 5
 16, 50, 406, 1258008, 25465014649108, 208080288305986199465852412572946560 (list; graph; refs; listen; history; text; internal format)
 OFFSET 4,1 COMMENTS Let "N_b" denote "N read in base b" and let "N" denote "N written in base 10" (as in normal life). The sequence is given by 16, 32_16, (64_32)_16, ((128_64)_32)_16, etc., or in other words ......16....32.....64....128.......etc. ..............16.....32.....64......... .......................16.....32....... ................................16..... where the subscripts are evaluated from the top downwards More precisely, "N_b" means "Take decimal expansion of N and evaluate it as if it were a base-b expansion". The next term is too large to include. A "dungeon" of numbers. REFERENCES 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 David Applegate, Marc LeBrun and N. J. A. Sloane, Descending Dungeons and Iterated Base-Changing, arXiv:math/0611293 [math.NT], 2006-2007. David Applegate, Marc LeBrun, N. J. A. Sloane, Descending Dungeons, Problem 11286, Amer. Math. Monthly, 116 (2009) 466-467. EXAMPLE (64_32)_16 = (6*32 + 4)_16 = 196_16 = 1*256 + 9*16 + 6 = 406. CROSSREFS Cf. A121863, A121263, A121266, A121264, A121265, A121295, A121296, A111050, A121866, A122029, A122030. Sequence in context: A231840 A199809 A121863 * A221485 A204723 A204962 Adjacent sequences:  A121861 A121862 A121863 * A121865 A121866 A121867 KEYWORD nonn,base AUTHOR N. J. A. Sloane, Aug 31 2006, corrected Sep 05 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.

Last modified October 15 12:02 EDT 2018. Contains 316232 sequences. (Running on oeis4.)