Prime Curios!: 907

907
(another Prime Pages' Curiosity)

Curios:

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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]

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