Inspired by this market, and this one.

I have a favorite number. It's a number that is in some sense "interesting", so it's feasible for people to guess. (Though opinions can differ on the interestingness of a certain number.) Note that my definition of "number" for the purposes of this market is very loose, so it might include things you wouldn't normally consider to be numbers.

Each user gets to ask one YES or NO question about my favorite number, which I will answer honestly.

If their question was "is it [number]?" and the answer is yes, then I'll manalink that person M$50 and resolve the market to YES. Otherwise it resolves NO at the beginning of February.

(Any questions attempting to use this to divine other information, such as "is the first digit of your favorite number the same as the first digit of your credit card number?" will be disqualified. Any questions that are too hard for me to answer are also invalid.)

(There's no 20-question limit, that's just the traditional name of this game. It's one question per user.)

Here's is a list of all questions that have been asked so far and their answers:

• Alana: "Is it 69?" No.

• Elspeth: "Is it a member of the set of complex numbers?" Yes.

• Elspeth [allowed due to error on my part]: "Is it a member of the set of complex numbers and have both a nonzero imaginary portion and a nonzero real portion?" No.

• Jacknaut: "Is it listed on https://en.wikipedia.org/wiki/List_of_numbers?" Yes.

• NeonNuke: "Is it an integer?" No.

• Josh: "In that Wikipedia list, is it under either 'Numbers representing physical quanties' or 'Transfinite numbers'?" No.

• Martin Randall: "Is it a real number?" Yes.

• Moneylab: "Is it pi?" No.

• Levi Finkelstein: "is it in the set [Φ, sqrt(2), tau, e, ln 2]?" No.

• Tassilo Neubauer: "Is it in the interval (0,1)?" Yes.

• Heliscone: "Is it listed under section 5 of the Wikipedia list?" No.

• muffins: "Is it listed under section 6.1 of the Wikipedia list?" No.