The book is now available! 907
(another Prime Pages' Curiosity)
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+ 907, 9907, 99907, 999907, and 9999907 are all primes; however, 99999907 is composite.

+ 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]

(There is one curio for this number that has not yet been approved by an editor.)

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