Hecho general: 1305 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 1305 is the number of graphs with 11 vertices and 9 edges.
Trivia: 1305 is an uninteresting number.
Fecha histórica: July 28th is the day in 2005 that the Provisional Irish Republican Army calls an end to its thirty year long armed campaign in Northern Ireland.