2 problems

Totient threshold conjecture. If $\varphi(M-1)/2\geq 2$, then $C_M$ does not admit a representation

Let $C_n(t,\lambda)$ be the secular polynomial of the quartic anharmonic oscillator, and let … be its discriminant with respect to $\lambda$. Let $Y_n(t)$ denote the Vorob'ev–Yablo…