Integers x such that there exist four integers 0<y<=z<=t<=w such that psi(x)^4 = x^4 + y^4 + z^4 + t^4 + w^4.

A391536

Integers x such that there exist four integers 0<y<=z<=t<=w such that psi(x)^4 = x^4 + y^4 + z^4 + t^4 + w^4.