Not to be confused with Ball bearing. Bearing balls are special highly spherical and smooth balls, most commonly used in ball bearings, but also used as components in things like freewheel mechanisms. The balls come in many different grades.
Euler Prime. Let a prime number generated by Euler's prime-generating polynomial be known as an Euler prime. Then the first few Euler primes occur for , 2, ..., 39, 42, 43, 45, ... (OEIS A056561), corresponding to the primes 43, 47, 53, 61, 71, 83, 97, 113, 131, 151, 173, ... (OEIS A005846).
The coefficients are naturally analogous to the binomial coefficients, and can be arranged in a triangle like Pascalâs. These coefficients are known as Eulerian numbers, and the construction above is known as Eulerâs Number Triangle (not to be confused with the geometric construction called the Euler Triangle).