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OeisWiki:Community Portal

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This page contains notes about the status of the OEIS wiki. It provides a brief description of the wiki setup. It will also be used to announce changes in the structure of the wiki, so it may be useful to add it to your watchlist by clicking on the watch tab at the top of the page.

Users can create and modify discussion pages here. The discussion pages are a reasonable place to make comments about the structure of the wiki.

Do not use the discussion pages to suggest changes to OEIS sequence entries.

An account is necessary to contribute to the Wiki. To request an account, click here. There was a time when the username was required to be your Real Name. This is no longer required, but is strongly recommended. If this evolving statement causes you to want to change your username, send email to David, and I can make the change.

A few preliminary pages (most of these need to be updated!)

Sequence of the Day for June 25

A008908: Number of halving and tripling steps to reach 1 in the 3x + 1 problem.

{ 1, 2, 8, 3, 6, 9, 17, 4, 20, 7, 15, 10, 10, ... }

What is so fascinating about this sequence is that it looks so random, and yet there is a precise method to determine its terms. Though the question remains whether or not there is a term that is actually null (that is to say, that 1 is never reached), due to either

  • the process entering a loop (of finite length) after a finite number of steps;
  • the process growing without bounds [might one say: entering a loop (of infinite length) after a finite number of steps? (this would allow merging the two potentialities into one!)].