Euler discovers that the formula x2 + x + 41 with x = 0 … 39 generates only prime numbers. The same result is achieved with, in place of 41, the numbers q = 2, 3, 5, 11, 17, producing prime numbers up to q-2. It will later be discovered that Euler was sitting on a formula that will break the impasse on prime numbers, but it will take another hundred years and the mind of Riemann to do so. But it will be another great mind, Gauss, who with one of his classic lateral moves, will suggest to Riemann the path to follow.
