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+ 673 is the second prime to divide more than one number of the form p# - 1 (673 divides both 149# - 1 and 193# - 1).

+ 673 divides 3333333331. It is the second number of the form (3)w1 to be found composite after many mathematicians thought all numbers of that form were prime.

+ The Louvre Pyramid is made up of 673 glass lozenges and triangles, not counting the doors.

+ Chlorophyll a fluoresces at 673 nanometers.

+ The smallest prime adjacent to any 3-perfect number. [Loungrides]

+ 673 = 1(mod 6) = 1(mod 7)= 1(mod3). [Bergot]

+ There are 673 numbers N with no two same digits, having the property that when the sum of the k leftmost digits of N is divided by k the result is always an integer. [Post and Dale]

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