Prime values of Ramanujan's tau function

Boyuan Xiong

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arXiv · 2311.12073

Prime values of Ramanujan's tau function

Boyuan Xiong

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Abstract

We study the prime values of Ramanujan's tau function $\tau(n)$. Lehmer found that $n=251^2=63001$ is the smallest $n$ such that $\tau(n)$ is prime: $$\tau(251^2)=-80561663527802406257321747.$$ We prove that in most arithmetic progressions (mod 23), the prime values $\tau$ belonging to the progression form a thin set. As a consequence, there exists a set of primes of Dirichlet density $\frac{9}{11}$ which are not values of $\tau$.

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Boyuan Xiong. 2023-11-19. Prime values of Ramanujan's tau function. https://arxiv.org/abs/2311.12073

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