 For example, formula_91, since there are five primes less than or equal to 11.Methods such as the Meissel–Lehmer algorithm can compute exact values of formula_89 faster than it would be possible to list each prime up to formula_1.The prime number theorem states that formula_89 is asymptotic to formula_95, which is denoted as
and means that the ratio of formula_89 to the right-hand fraction approaches 1 as formula_1 grows to infinity.