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  2. Euclid's theorem - Wikipedia

    en.wikipedia.org/wiki/Euclid's_theorem

    Since no prime number divides 1, p cannot be in the list. This means that at least one more prime number exists that is not in the list. This proves that for every finite list of prime numbers there is a prime number not in the list. [4] In the original work, Euclid denoted the arbitrary finite set of prime numbers as A, B, Γ. [5]

  3. Furstenberg's proof of the infinitude of primes - Wikipedia

    en.wikipedia.org/wiki/Furstenberg's_proof_of_the...

    In mathematics, particularly in number theory, Hillel Furstenberg's proof of the infinitude of primes is a topological proof that the integers contain infinitely many prime numbers. When examined closely, the proof is less a statement about topology than a statement about certain properties of arithmetic sequences.

  4. Dirichlet's theorem on arithmetic progressions - Wikipedia

    en.wikipedia.org/wiki/Dirichlet's_theorem_on...

    In particular, the proof of the example of infinitely many primes of the form + makes an argument similar to the one made in the proof of Euclid's theorem (Silverman 2013). The proof is given below: We want to prove that there are infinitely many primes of the form +.

  5. 10 Hard Math Problems That Even the Smartest People in the ...

    www.aol.com/10-hard-math-problems-even-150000090...

    When two primes have a difference of 2, they’re called twin primes. So 11 and 13 are twin primes, as are 599 and 601. Now, it's a Day 1 Number Theory fact that there are infinitely many prime ...

  6. Primes in arithmetic progression - Wikipedia

    en.wikipedia.org/wiki/Primes_in_arithmetic...

    It follows immediately that there are infinitely many AP-k for any k. If an AP-k does not begin with the prime k, then the common difference is a multiple of the primorial k# = 2·3·5·...·j, where j is the largest prime ≤ k. Proof: Let the AP-k be a·n + b for k consecutive values of n.

  7. Prime number - Wikipedia

    en.wikipedia.org/wiki/Prime_number

    It leads to another proof that there are infinitely many primes: if there were only finitely many, then the sum-product equality would also be valid at ⁠ = ⁠, but the sum would diverge (it is the harmonic series ⁠ + + + … ⁠) while the product would be finite, a contradiction.

  8. Arithmetic progression topologies - Wikipedia

    en.wikipedia.org/wiki/Arithmetic_progression...

    Both the Furstenberg and Golomb topologies furnish a proof that there are infinitely many prime numbers. [1] [2] A sketch of the proof runs as follows: Fix a prime p and note that the (positive, in the Golomb space case) integers are a union of finitely many residue classes modulo p. Each residue class is an arithmetic progression, and thus clopen.

  9. Euclid number - Wikipedia

    en.wikipedia.org/wiki/Euclid_number

    In mathematics, Euclid numbers are integers of the form E n = p n # + 1, where p n # is the nth primorial, i.e. the product of the first n prime numbers. They are named after the ancient Greek mathematician Euclid, in connection with Euclid's theorem that there are infinitely many prime numbers.