74444...44447 (121-digits)

This number is a prime.

                    7 4444444444 4444444444 4444444444 4444444444 4444444444
4444444444 4444444444 4444444444 4444444444 4444444444 4444444444 4444444447

+ The only square-congruent depression prime of order 11. [Loungrides]

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