M_{22}.2

L_{3}(4).2_{2}  22  1a^{+} + 21a^{+}  2

Character Numbers: [ 1, 3 ]

\begin{aligned}& S_{1} & S_{2} \\ χ_{1} & 1 & 21 \\ χ_{2} & 1 & −1 \end{aligned}

Ramanujan Graphs: [ 2 ]