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+ All the digits are prime and the sum of the digits of this palindromic composite is 11, a palindrome prime. Note that the product of the digits is 28, a perfect number. [Skaflotten]

+ 2722 + 2727 + 2722 + 1 is prime. [Opao]

+ n6 + 272 is composite for all n up to 2162. [Wesolowski]




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