5555
This number is a composite.
Just showing those entries submitted by 'Loungrides': (Click here to show all)
The 2nd repdigit number consisting of 5’s whose the product
with all its truncations plus 2 is prime, i.e.,
5555*555*55*5+2=847831877. The previous such prime is
55*5+2=277 and the next is 55555555*5555555*…*5+2. [Loungrides]
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