786444domain: NAppears in sequencesSolutions to phi(gpf(x)) - gpf(phi(x)) = 65534 = c are special multiples of 65537, x=65537*k, where the largest prime factors of factor k were observed in {2, 3, 5, 17, 257}.at n=8A070816Numbers k such that phi(k) is a perfect 9th power.at n=25A078169