15365639domain: NPropertiesPrimalityPrimeyesAppears in sequencesConsider primitive solutions (x,y,z) to x^4+y^4+z^4=w^4 with 0<x<=y<=z arranged in order of increasing w; sequence gives y values.at n=6A078519Numbers k such that k^4 = x^4 - y^4 - z^4.at n=4A175598Prime numbersat n=992833