This number is a prime.
2843^5 = 2731^5 + 1933^5 + 1459^5 + 709^5 + 509^5 + 271^5 + 31^5, i.e., a prime fifth power written as a sum of seven prime fifth powers. Found by Jean-Charles Meyrignac. [Rivera]
(There is one curio for this number that has not yet been approved by an editor.)
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