Co_{2}

U_{6}(2) ≤ U_{6}(2).2 4600 1a + 23a + 275a + 2024a + 2277a 5

Character Numbers: [ 1, 2, 4, 6, 7 ]

S_{1} S_{2} S_{3}  S_{4}  S_{5}
χ_{1} 1 1 891 891 2816
χ_{2} 1 −1 297 −297  0
χ_{3} 1 1 63  63 −128
χ_{4} 1 1 −9 −9  16
χ_{5} 1 −1 −3  3  0

Ramanujan Graphs: [ 2, 3, 4, 5 ], [ 3, 4, 5 ]