19

This number is a prime.

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Waring conjectured in 1770 that every positive integer can be expressed as a sum of at most 19 biquadrates (fourth powers). This was later proven by Balasubramanian, Deshouillers, and Dress.

Submitted: 1999-09-02 23:40:00; Last Modified: 2008-06-06 21:55:59.