2503
This number is a prime.
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The only 4-digit Friedman number that is prime, i.e., 2503 = 50^2 + 3. [Loungrides]
The largest prime that can be expressed as the sum of three different 3-digit zeroless palindromic primes, i.e., 2503 = 787 + 797 + 919. [Loungrides]
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