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Let $ \mathfrak{C}^+_{ns}(p) $ be the Cuspidal Divisor Class Group of themodular curves $X^+_{ns}(p) $ associated to the normalizer of a non-splitCartan subgroup of level $ p$. I study the $ p-$primary part of $\mathfrak{C}^+_{ns}(p) $ and estimate the order of growth of $|\mathfrak{C}^+_{ns}(p)| $.

Properties of cuspidal divisor class numbers of non-split Cartan modular curves