This post is mainly a test of LaTeX, a math typesetting language, and its built-in functionality in WordPress. As a bonus, there is actually a paper entitled “On the Number of Primes Less than a Given Magnitude” (Riemann, 1859 [pdf]), which, unsurprisingly, is much more difficult than this.
Let be a prime number. Then , the number of magnitudes less than or equal to a given prime, is equal to
because there are infinitely many real numbers less than or equal to any prime.