"Landau's problems" meaning in English

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        "Four basic unsolved problems about prime numbers: (i) is Goldbach's conjecture true?; (ii) is the twin prime conjecture true?; (iii) is Legendre's conjecture true?; (iv) are there infinitely many primes p such that p − 1 is a perfect square?"
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          "Legendre's conjecture",
          "Legendre's conjecture"
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        "(mathematics) Four basic unsolved problems about prime numbers: (i) is Goldbach's conjecture true?; (ii) is the twin prime conjecture true?; (iii) is Legendre's conjecture true?; (iv) are there infinitely many primes p such that p − 1 is a perfect square?"
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        "mathematics",
        "sciences"
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        "Edmund Landau"
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  "etymology_text": "Listed by Edmund Landau at the International Congress of Mathematicians in 1912.",
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          "Legendre's conjecture",
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        "(mathematics) Four basic unsolved problems about prime numbers: (i) is Goldbach's conjecture true?; (ii) is the twin prime conjecture true?; (iii) is Legendre's conjecture true?; (iv) are there infinitely many primes p such that p − 1 is a perfect square?"
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