# 1398023584459

This number is a prime.

139 8023584459

Jacobi and Madden proved that there are infinitely many
solutions for the equation a^{4} +
b^{4} +
c^{4} +
d^{4} =
(a+b+c+d)^{4}. In July 2009, Seiji
Tomita found the following solution by using their method:
1058103081810^{4} +
535945811334^{4} +
(-1140105961325)^{4} +
944080652640^{4} =
1398023584459^{4}. [Capelle]

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