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# 818

This number is a composite.

818 is the smallest palindrome that may be expressed as the sum of the squares of two primes (23^{2} + 17^{2}). [King]

818 is the only 3-digit tetradic integer such that the sum of the differences of the number and each digit raised to the digit is prime. I.e., (818-8)^8+(818-1)^1+(818-8)^8 is prime. [Opao]

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