Question

Determine counterfeit in a collection of $3^n -1$ coins in n weighings

score 564 · Answer 1 · 2026-04-02 05:58:41

564

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Determine counterfeit in a collection of $3^n -1$ coins in n weighings

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score 1k · Answer 2 · 2026-04-01 16:53:23

1k

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score 1k · Answer 3 · 2026-03-25 01:13:10

1k

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score 204 · Answer 4 · 2026-03-17 12:16:03

204

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score 378 · Answer 5 · 2026-04-01 04:10:54

378

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score 128 · Answer 6 · 2026-04-09 00:33:29

128

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Who wins? From tokens marked $1$ to $N$, players alternate removing a token (marked $x$) and all tokens marked with divisors of $x$.

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score 1.6k · Answer 7 · 2026-03-26 14:17:14

1.6k

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score 128 · Answer 8 · 2026-03-25 11:14:51

128

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How fast does $\frac{1}{n!} \sum_{k=0}^n k(n-k)!$ grow, as a function of $n$?

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score 728 · Answer 9 · 2026-04-09 04:50:57

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score 785 · Answer 10 · 2026-03-31 18:43:04

785

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1.5k

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score 114 · Answer 12 · 2026-04-10 02:39:03

114

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score 3.6k · Answer 13 · 2026-04-09 17:48:15

3.6k

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score 437 · Answer 14 · 2026-04-09 05:13:02

437

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Published on 09 Apr 2026 - 5:13

score 296 · Answer 15 · 2026-04-09 03:40:56

296

Views

Matchstick Patterns with limited numbers of matches eg 100, 1000

Published on 09 Apr 2026 - 3:40

List Question

Determine counterfeit in a collection of $3^n -1$ coins in n weighings

Cool riddle involving integer vectors

Converting 3d euler angles to 2d

To Mock a Mockingbird - Exclusive Club (logic puzzle)

Drunk man on a cliff

Who wins? From tokens marked $1$ to $N$, players alternate removing a token (marked $x$) and all tokens marked with divisors of $x$.

Logic Knights and Knaves problem involving implication question

How fast does $\frac{1}{n!} \sum_{k=0}^n k(n-k)!$ grow, as a function of $n$?

Formula to calculate possible combination of words in a 3x3 crossword grid

Calculus Puzzle Book?

My Simple Combinatorial Method to Enumerate All Sudoku Solution Grids

8×8 chessboard with numbers in them and you are allowed to switch them

Maximum of minimum number of moves required for hardest 8 puzzle

Brain teaser: what is the optimal strategy of choosing boxes with a friend to maximize payment?

Matchstick Patterns with limited numbers of matches eg 100, 1000

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