Prime Curios!: 673

673
(another Prime Pages' Curiosity)

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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]

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