pi

It is known that there is no answer whatsoever to the calculation of that relationship, ending with the ellipses that stand for "and so on" (one is reminded of the Greek pi: 3.141592 ...).

Although we all learned in school that [pi] equals 3.141592 ..., it appears that the Tanakh claims 3 as an exact or at least approximate value of n.

Pi is the 16th letter of the Greek alphabet; written as p it's a transcendental number (3.141592) which is fundamental to mathematics and the ratio of the circumference of a circle to its diameter.