Weight 1 for level N=20
From Sect. 21.1 we know that for primes p≥7 there are 9 new holomorphic eta products of weight 1 for Γ∗(4p) and another 60 such eta products for Γ0(4p). Table 24.1 shows that the corresponding numbers of eta products are slightly larger for level N=4⋅5=20 and considerably larger for level N=4⋅3=12. In the present section we are going to discuss theta series identities for the eta products of weight 1 and level 20.
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