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(2 * 2521)  1 = 71^{2} and 2 * (2521  1) = 7!. [Forslund] 2521 minus one is the smallest EPORN. 2521^{2} = 1456^{3}  1455^{3}, i.e., one solution to the Diophantine equation z^{2} = x^{3}  y^{3}. A Diophantine equation is a polynomial equation in which only integer solutions are allowed. These are named after the Greek algebraist Diophantus who lived in the 3rd century. [Mizuki] The smallest prime formed by concatenating consecutive composite odd numbers. [Green]
(There is one curio for this number that has not yet been approved by an editor.)
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