305

305 is a natural number that lies between 304 and 306. In base-10 it is written with the digits 3, 0, and 5. It is an odd, composite number with prime factorization 5 × 61. Because it ends in 5, it is divisible by 5, but the digit sum is 8, so it is not divisible by 3 or 9.

In telecommunications, 305 is the area code for southern Florida, including Miami and the Florida Keys. It was originally assigned in 1988 and, together with the 786 overlay, serves much of the Miami metropolitan region.

In computing, 305 is the HTTP status code “Use Proxy.” This code indicates that the requested resource must be accessed through the proxy specified by the server. It is defined in earlier HTTP specifications but is rarely used today due to security and practicality concerns.

In astronomy, 305 Martha is a main-belt asteroid. It is designated by the numeric identifier 305, reflecting its order of discovery and cataloging as a minor planet.

In historical terms, the year 305 CE is noted for the abdication of Roman emperors Diocletian and Maximian, an event associated with the end of the Tetrarchy and a shift in the administrative structure of the late Roman Empire.