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Steven and Conrad are brothers. They both also really like numbers.
One day, at a conference, I watched them play a guessing game using some code they had written back in 2007.
Steven: OK, guess which country is number 1 on my list.
Conrad: USA.
Steven: Wrong. They are third...
This puzzle is part of the Monthly Topic Challenge August 2026: Twisted Chestnut.
A boy and his father are caught in a car accident. The father dies and the boy is transported into the hospital for surgery...
Submission for Monthly Topic Challenge August 2026: Twisted Chestnut.
A point-shaped alien lives on a perfectly spherical planet with radius 100km. One day the alien goes for a walk. They walk sou...
This is a game named "Block Blast!": you are given three pieces and must place them on the board in order to receive three other pieces, and so on... If you cannot place all the pieces you got, the game ends. And any time you fill a column or line, it disappears.
P.s.: Rotations are not allowed, and as soon as a line/column is filled it disappears, even if you have pie...
A problem proposed by Ashay Burungale of Satara, Maharashtra, India, in the November 2008 issue of American Mathematical Monthly:
In a certain town of population 2n + 1, all relations are reciprocal: If Person 1 knows Person 2, then Person 2 knows Person 1. Moreover, we know that for any set A consisting of n citizens, there’s some person among the remaining ...