V. Level 5. The McKay-Thompson series of class 5B for the Monster.
j5B(τ)=(η(τ)η(5τ))6
Examples. Surprisingly, the following "cubes" are powers of the golden ratio ϕ=1+√52 j5B(1+√−7/52)=−(√5)3ϕ3j5B(1+√−23/52)=−(√5)3ϕ9j5B(1+√−47/52)=−(√5)3ϕ15 These discriminants d=5m have class number h(−d)=2.
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