J_{2}

U_{3}(3) 100 1a + 36a + 63a 3

Character Numbers: [ 1, 6, 7 ]

S_{1} S_{2} S_{3}
χ_{1} 1 36 63
χ_{2} 1 6 −7
χ_{3} 1 −4 3

Ramanujan Graphs: [ 2 ], [ 2, 3 ], [ 3 ]