A group of four people can stand two by two, but a group of five people can only stand five in a line. The number of numbers like five, and not like four, between two numbers, is the number of times you take two times what you had, starting at one, to get between the two numbers if the two numbers are close.
The Prime Number Theorem
A group of four people can stand two by two, but a group of five people can only stand five in a line. The number of numbers like five, and not like four, between two numbers, is the number of times you take two times what you had, starting at one, to get between the two numbers if the two numbers are close.