Fait général: 1730 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 1730 is the sum of consecutive squares in 2 ways.
Culture générale: 1730 is an uninteresting number.
Date historique: September 25th is the day in 1804 that the Teton Sioux (a subdivision of the Lakota) demand one of the boats from the Lewis and Clark Expedition as a toll for moving further upriver.