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Landau's problems

four basic unsolved problems about prime numbers: Goldbach’s conjecture; twin prime conjecture; Legendre’s conjecture; whether there are infinitely many primes of the form 𝑛²+1

Pronunciation
/ˈlænˌdaʊz ˈprɑbləmz/
/ˈlaʊz ˈprɒbləmz/