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7(57)_3124 = (75*10^624957)/99 is a palindromic prime containing the two largest possible smoothly undulating prime digits (i.e., 5 and 7). This number, also called smoothly undulating palindromic prime (SUPP), is the "sister" of 3(23)_3479 = (32*10^695923)/99. [Rosenthal and Martin]
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