3917

This number is a prime.

+ The smallest prime (emirp) with Hamming weight n (i.e. with exactly n 1s when written in binary): 2 + 3 + 7 + 23 + 31 + 311 + 127 + 383 + 991+ 2039 = 3917. [Post]

(There are 2 curios for this number that have not yet been approved by an editor.)

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