,
,
is a 
is 
,
is a 
is also prime
to 
have the digit 
and are divisible by 
?
Y by Andyluo, DhruvJha, Bummer12345, mithu542, Exponent11, skronkmonster
Don't forget to greet Richard if encountered in the hallway. He's retiring early at 53, so it's a good chance to wish him well!
Seminar on May 11:
Preparing Strong Math Students for College and Careers
9:30 – 10:30am ET | Anacostia Ballroom
Presented by Richard Rusczyk, Art of Problem Solving Founder.
Retirement announcement from Richard (3/24/2025)
I write today to announce my retirement as CEO from Art of Problem Solving. When I founded AoPS 22 years ago, I never imagined that we would reach so many students and families, or that we would find so many channels through which we discover, inspire, and train the great problem solvers of the next generation. I am very proud of all we have accomplished and I’m deeply grateful to all the AoPS team members who have helped build AoPS. I’m also thankful for the many supporters who provided inspiration and encouragement along the way.
I’m delighted to introduce our new leaders – Ben Kornell and Andrew Sutherland. Ben has extensive experience in education and edtech prior to joining AoPS as my successor as CEO, including starting like I did as a classroom teacher. He has a deep understanding of the value of our work because he’s an AoPS parent! Meanwhile, Andrew and I have common roots as founders of education companies; he launched Quizlet at age 15! His journey from founder to MIT to technology and product leader as our Chief Product Officer traces a pathway many of our students will follow in the years to come.
Seminar on May 11:
Preparing Strong Math Students for College and Careers
9:30 – 10:30am ET | Anacostia Ballroom
Presented by Richard Rusczyk, Art of Problem Solving Founder.
Retirement announcement from Richard (3/24/2025)
I write today to announce my retirement as CEO from Art of Problem Solving. When I founded AoPS 22 years ago, I never imagined that we would reach so many students and families, or that we would find so many channels through which we discover, inspire, and train the great problem solvers of the next generation. I am very proud of all we have accomplished and I’m deeply grateful to all the AoPS team members who have helped build AoPS. I’m also thankful for the many supporters who provided inspiration and encouragement along the way.
I’m delighted to introduce our new leaders – Ben Kornell and Andrew Sutherland. Ben has extensive experience in education and edtech prior to joining AoPS as my successor as CEO, including starting like I did as a classroom teacher. He has a deep understanding of the value of our work because he’s an AoPS parent! Meanwhile, Andrew and I have common roots as founders of education companies; he launched Quizlet at age 15! His journey from founder to MIT to technology and product leader as our Chief Product Officer traces a pathway many of our students will follow in the years to come.
