881
This number is a prime.
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The smallest nontrivial (mutidigit) Sophie Germain prime p such that p-pi(p) is a perfect cube, i.e., (881-152 = 9^3). [Bajpai]
The smallest prime p such that the concatenation of pi(p) and p {152||881} is a perfect square (152881 = 391^2). [Bajpai]
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