Using your Head is Permitted

March 2013 riddle

Consider Sequence A185028 of the Online Encyclopedia of Integer Sequences.

Can you answer the question that appears in the "COMMENTS"? Specifically, can you prove or disprove the finiteness of the sequence?

The sequence and the question were both formulated by Moshe Wolf. It got to me in riddle form by Oded Margalit. Thanks, Oded and Moshe!

List of solvers:

Luke Pebody (1 March 03:36)
Joseph DeVincentis (1 March 05:20)
Radu-Alexandru Todor (1 March 12:12)
Dan Dima (2 March 00:59)
Thomas Mack (2 March 03:10)
Sen Gu (2 March 20:18)
Todd Will (4 March 02:06)
Andreas Stiller (4 March 05:26)
Albert Stadler (6 March 19:05)
Øyvind Grotmol (6 March 20:44)
Jan Fricke (7 March 21:58)
Itsik Horovitz (8 March 01:00)
Liubing Yu (13 March 07:41)
Zilin Jiang (13 March 10:36)
Daniel Bitin (18 March 08:27)
Harald Bögeholz (26 March 08:06)
Hooman Habibi (27 March 04:23)

Elegant and original solutions can be submitted to the puzzlemaster at Names of solvers will be posted on this page. Notify if you don't want your name to be mentioned.

The solution will be published at the end of the month.


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