Then the sum of all | DEFINITE INTEGRATIONn |JEE MAIN 2026

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JEE MAIN 2022

25-07-2022_S2

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Let $a_n=\int_{-1}^n\left(1+\frac{x}{2}+\frac{x^2}{3}+\ldots . .+\frac{x^{n-1}}{n}\right) d x$ for every $n \in N$. Then the sum of all the elements of the set $\left\{n \in N: a_n \in\right.$ $(2,30)\}$ is $\_\_\_\_$ .

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