87575...00000 (91-digits)

This number is a composite.

                                                     8 7575655267 3714132914
4224570907 6814455838 4501872333 5433071911 6772932797 2851909866 2912000000

Just showing those entries submitted by 'Hartley': (Click here to show all)

Let this number be C. C is the smallest number which can be written as 2a^2, 3b^3 and 5c^5 for which also C+1 and C-1 are prime. [Hartley]