377

This number is a composite.

+ 377 = 2^2 + 3^2 + 5^2 + 7^2 + 11^2 + 13^2, i.e., the sum of squares of the first six primes. [Mizuki]

+ The largest known Fibonacci number whose digits are all primes. [Capelle]

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

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