87575...00000 (91-digits)
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Prime Puzzio
Test Number
8 7575655267 3714132914
4224570907 6814455838 4501872333 5433071911 6772932797 2851909866 2912000000
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
]
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