American Mathematical Monthly Problems

The American Mathematical Monthly is an expository journal intended for a wide audience of mathematicians, from undergraduate students to research professionals. Each issue has a Problems and Solutions section where new problems are proposed.
A good portion of solutions to problems from past years can be found in the book More Monthly Problem Gems, which I had the pleasure of co-authoring with Hongwei Chen.
Below there is a list of the recent problems I liked the most.


Problem 12574 - Tuan Anh Nguyen (Vietnam).

Problem 12571 - V. Bobkov and T. Galimov (Russia).

Problem 12570 - R. Rogozsan (Romania).

Problem 12567 - T. Yegoryan (Armenia).

Problem 12566 - P. Bracken (USA).

Problem 12565 - F. Stanescu (Romania).

Problem 12563 - Tran Quang Hung (Vietnam).

Problem 12561 - D. E. Knuth (USA).

Problem 12559 - H. Ohtsuka (Japan) and R. Tauraso (Italy).

Problem 12558 - J. C. Lagarias (USA) and S. Reterink (Netherlands).

Problem 12556 - D. Neziri (Kosovo).

Problem 12555 - H. Chen (China).

Problem 12552 - Tuan Anh Nguyen (Vietnam).

Problem 12551 - A. Inan (Turkey).

Problem 12548 - A. Desai (India).

Problem 12544 - M. A. Alekseyev (USA).

Problem 12542 - L. Dong (Vietnam).

Problem 12539 - R. Tauraso (Italy).