You would have to show what you did try. Typically, you can describe that in the form of a partial result (see for example https://en.wikipedia.org/wiki/Goldba

You would have to show what you did try. Typically, you can describe that in the form of a partial result (see for example https://en.wikipedia.org/wiki/Goldbach%27s_conjecture#Partial_results https://en.wikipedia.org/wiki/Goldbach%27s_conjecture#Partia...) or as another conjecture.