Fatto generale: 1504 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 1504 is the number of anisohedral 21-iamonds.
Trivia: 1504 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Data storica: February 12th is the day in 1851 that Edward Hargraves announces that he has found gold in Bathurst, New South Wales, Australia, starting the Australian gold rush.