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The molecular weight of chlorophyll b is about 907. [Wu]

Conjectured to be the largest prime that can be represented uniquely as the sum of three distinct positive squares (3² + 13² + 27²). [Noe]

The largest negated discriminant of imaginary quadratic fields with class number 3. There are 16 = 9+0+7 such discriminants. [Hasler]

The largest area code (in physical size) in the United States. It covers the entire state of Alaska, except for the small southeastern community of Hyder. [Green]