Cody

William

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William liked Problem 45250. Be happy

on 6 Jan 2020

William submitted a Comment to Problem 45250. Be happy

Well, it appears to me that the number 742356 is a pre-periodic point of the perfect digital invariant n=8 in base 3. However, since the perfect digital invariant is n=8 rather than n=1, this is not a happy number. At least, that is how I read it!

on 6 Jan 2020

William submitted a Comment to Problem 45250. Be happy

Asif: Yes, I am now seeing a discrepancy with problem 6, but all the others agree with my code.

on 6 Jan 2020

William submitted a Comment to Problem 45250. Be happy

Asif: If I am reading that reference correctly, then test suite problems 4 and 7 are incorrect. In fact, problem 4 has base b=4, and according to the reference b=4 is a "happy base" in which *all* numbers are happy.

on 5 Jan 2020

William submitted a Comment to Problem 45255. Find the sequence

Asif, Test suite problems 6-10 are pretty peculiar! Did you mean to have them that way?

on 4 Jan 2020

William liked Problem 45249. Frugal number

on 31 Dec 2019

William submitted a Comment to Problem 2254. Possible Opponents Matrix for single-elimination tournament

Faulty test suite. The 'for v = 1:10' in problem 5 has a semicolon after it.

on 26 Dec 2019

William submitted a Comment to Problem 45239. Checkmate-02

Asif, Thanks for the clarifications. In problem 2, I was aware of the rook at h3, but there is also a pawn at h5 that makes Kh7 a legitimate solution I think (one that is harder to detect programmatically). As in problem 9, it complicates the solution a little more than you intended.

on 26 Dec 2019

William submitted a Comment to Problem 45239. Checkmate-02

Asif, I think that several of the problem solutions need review. 1. In problem 2, 'Kf7' should not be in the solution since it is adjacent to 'Ke7'. Isn't the correct result {'Kh7',''Kg7','Kf5'}? 2. In problem 7, the king could take any of the knights. Is the solution listed as pos = [] because there are 3 knights on the board? If so, why is the solution to problem 9 listed as 'checkmate'? If not, a solution to problem 9 would be {'Ka3','Ka2'}. Similar questions apply to problem 8. 3. Why is 'Kc7' not in the solution of problem 3? I'm afraid I have a lot to learn about chess!

on 24 Dec 2019

William liked Problem 45238. Checkmate

on 23 Dec 2019

William submitted a Comment to Problem 45238. Checkmate

Asif, Aha! Tricky, and very clever. Thanks for posting this interesting problem!

on 23 Dec 2019

William submitted Solution 2067529 to Problem 45238. Checkmate

on 23 Dec 2019

William submitted a Comment to Problem 45238. Checkmate

Asif, Thanks, but my point is that the pawn is in row-1 in *both* cases, so they should both be in check or neither should be in check. Since you described 'x' as being the 'opponent King', I think that both should be in check.

on 22 Dec 2019

William submitted Solution 2066737 to Problem 45241. Question 1

on 22 Dec 2019

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