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Please cite/link your sources, if possible.
At some undetermined point in the future, at least a day from now, I will:
Vote up all interesting, relevant answers.
Accept what I consider the "best" answer.
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Gemar chatima tova, everybody!
A beis kor (the area in which a kor, about 500-700 lb., of grain can be sown) is defined in halachah as 75000 square cubits. Rashi (to Kiddushin 60b, ד"ה בית כור) points out that this is a square a bit more than 273 5/6 cubits to a side (and indeed, √75000 ≈ 273.86).
There were 273 more first-born men than l'viyim in Bamidbar.
