The hardest math equation is the 3x+1 (Collatz) conjecture.
The Collatz Conjecture is still not solved and remains one of mathematics most famous unsolved math problems, despite being easy to state and also having been verified by computer for numbers up to extremely large values like 268 or even higher with new algorithms.
Although a general mathematical proof for all positive integers is also still missing.
And mathematicians still continue to explore it, but some also believe that a proof may require entirely new mathematical tools.
Other hardest math equations that are hard to solve are the Riemann Hypothesis, as well as the Navier Stokes existence and smoothness.
These math equations have resisted solutions for decades and often involve immense complexity in number theory or even fluid dynamics,.
Another math puzzle has also stumped the smartest mathematicians in the world which is the x 3 +y 3 +z 3 =k, with k being all the numbers from one to 100, is a Diophantine equation.
The equation x3+y3+z3=k is known as the sum of cubes problem