74444...44447 (121-digits)
This number is a prime.
7 4444444444 4444444444 4444444444 4444444444 4444444444
4444444444 4444444444 4444444444 4444444444 4444444444 4444444444 4444444447
Just showing those entries submitted by 'Loungrides': (Click here to show all)
The only square-congruent depression prime of order 11. [Loungrides]
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