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This number is a prime.
This 458-digit prime can be written as 2^242 + 3^241 + 5^240 + ... + 1523^2 + 1531^1 = sum( k=1..242, prime(k)^(243-k)). It is the only prime of this form having more than 7 and less than 2000 digits. [Hasler]
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