19999...99999 (3021-digits)

This number is a prime.

+ A 'near-repdigit' prime number is one where all digits are identical except one; this one, 2*(10^3020)-1 is such a number, and was proven prime by H. C. Williams in 1985. [Dobb]

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

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