Explicit numerator conjecture for the orbit of Ψ1\Psi_1

Let

Ψ1:=(1111),(1011)+,\Psi_1:=\left\langle\begin{pmatrix}1&1\\1&1\end{pmatrix},\begin{pmatrix}1&0\\1&1\end{pmatrix}\right\rangle^+,

and consider its orbit of the indicated vector. Explicit Ψ1\Psi_1 numerator conjecture. Every non-square integer n>10569n>10569 appears as a numerator in the orbit Ψ1(22)\Psi_1\begin{pmatrix}2\\2\end{pmatrix}. This is presented as a computationally motivated explicit instance of the preceding local-global expectation; no proof or resolution is supplied.

Sources & referencesView supporting material

Primary source

James Rickards and Katherine E. Stange, “Reciprocity obstructions in semigroup orbits in SL(2, Z)”, arXiv:2401.01860 (2025).

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