Search Results
| Search type | Search syntax |
|---|---|
| Tags | [tag] |
| Exact | "words here" |
| Author |
user:1234 user:me (yours) |
| Score |
score:3 (3+) score:0 (none) |
| Answers |
answers:3 (3+) answers:0 (none) isaccepted:yes hasaccepted:no inquestion:1234 |
| Views | views:250 |
| Code | code:"if (foo != bar)" |
| Sections |
title:apples body:"apples oranges" |
| URL | url:"*.example.com" |
| Saves | in:saves |
| Status |
closed:yes duplicate:no migrated:no wiki:no |
| Types |
is:question is:answer |
| Exclude |
-[tag] -apples |
| For more details on advanced search visit our help page | |
Results tagged with puzzle
Search options not deleted
user 39521
Recreational mathematics or puzzles with serious mathematical content. Note that math contest problems are generally considered off-topic.
3
votes
Ulam spiral coordinate system
A while ago, Dan Pearcy approached me with a similar problem, asking for the inverse formula to convert $n$ into coordinates $(x,y)$. Using the floor function, it was not too difficult to provide an e …
- 12.4k
26
votes
Puzzle on deleting k bits from binary vectors of length 3k
I can, at least, answer your question 'Is this in fact the correct answer?' with an affirmative 'no'.
Specifically, we can replace the upper bound $2^{n/3} \approxeq 1.26^n$ with the slightly better …
- 12.4k