Linked from
The 27 pages that link to Riemann hypothesis, each with the reason it gives.
Prime numberRelated: Its truth would sharply constrain the error in estimates of prime distribution.
Number theoryRelated: Its truth would sharpen understanding of the distribution of prime numbers.
Analytic number theoryRelated: Its truth would sharply constrain errors in prime-counting estimates.
De Bruijn–Newman constantRelated: The hypothesis is equivalent to Λ being nonpositive.