20707

This number is a prime.

+ The smaller term in the only known case of a pair of primes (20707, 59561) of form (p^m + q^n, p^n + q^m), where p, q are consecutive primes and m, n consecutive composite numbers, i.e., (2^10 + 3^9, 2^9 + 3^10). [Loungrides]

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