16
votes
Do Langford squares exist?
mathematics
combinatorics
asked Mar 28, 2023 at 19:16
puzzling.stackexchange.com
16
votes
How does half a dozen remain?
riddle
mathematics
asked Jan 14, 2024 at 5:13
puzzling.stackexchange.com
16
votes
Find the heaviest and the second heaviest coins
strategy
weighing
asked Feb 26, 2024 at 20:17
puzzling.stackexchange.com
15
votes
Join six cities with roads
mathematics
geometry
graph-theory
asked Feb 10, 2024 at 23:21
puzzling.stackexchange.com
15
votes
Which positive integers have at least one positive integer multiple such that the base 10 representation of that multiple has only even digits?
mathematics
number-property
asked Jul 19, 2023 at 8:05
puzzling.stackexchange.com
15
votes
Additions to menagerie were strange but appreciated
enigmatic-puzzle
asked Oct 3, 2023 at 8:43
puzzling.stackexchange.com
15
votes
Fill the grid subject to product, sum and knight move constraints
mathematics
logical-deduction
calculation-puzzle
grid-deduction
knight-moves
asked Jul 7, 2024 at 7:41
puzzling.stackexchange.com
15
votes
What is the smallest interval between two palindromic times on a 24-hour digital clock?
optimization
time
asked Sep 23, 2024 at 7:34
puzzling.stackexchange.com
15
votes
Starting with 2014 "+" signs and 2015 "−" signs, you delete signs until one remains. What’s left?
mathematics
logical-deduction
asked Sep 8, 2024 at 6:31
puzzling.stackexchange.com
15
votes
Minimize the number of pieces in the cube that you build
optimization
dissection
asked Nov 3, 2024 at 21:45
puzzling.stackexchange.com
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