268897
This number is a prime.
268897 is the largest known prime p with the following
property: the number of primes between p^3 and (p+1)^3 is a
square. (The number of primes between 268897^3 and 268898^3
is 5783450401 = 76049^2.) There are only two smaller primes
with this property (3 and 151), and there are no others
less than 1000000. [Keith]
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