"Every of the three prime residue classes p=1 mod 3 contains an infinite number of primes and the three classes have the densities 1/2, 1/3, and 1/6", (HaH) S. 453

H. Hasse referred to it as "it would be probably more productive for number theory to work on it (cubic Gaussian sums with prime modul p=1mod.3) than working on Fermat's Last Theorem", (HaH), S. 453.

     

Braun, K., The Kummer conjecture, p-th cyclotomic polynomials, the zeta function at odd integers, and all that ....pdf