This number is a prime.
The only prime less than a googol that is a reverse
concatenation of the n first odd squares (n=3). [Loungrides]
2591 is the smallest prime p such that p divides the
numerator of the Bernoulli number B(p-17). [Luen]
2591 is the (2+5+9+1)th Honaker prime. [Watson]
(There are 3 curios for this number that have not yet been approved by an editor.)
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