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The product of the last two digits form a number that is equal to a number formed from the first two digits of this fourdigit number (21 = 3 * 7). [Avrutin]
7, 37, 137, and 2137 are prime. [Avrutin] Number of Santa Barbara's episodes. [Avrutin] The smallest titanic prime of the form (10^x+1)/11, where x = 2137. [Loungrides]
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