Can Fermat's Little Theorem Simplify Prime Number Computations?

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SUMMARY

Fermat's Little Theorem states that for a prime number p, the equation a^(p-1) ≡ 1 (mod p) holds true. In the discussion, participants explore the implications of assuming p-1 is even, leading to two conditions: a^(p-1)/2 ≡ 1 (mod p) or a^(p+1)/2 ≡ -1 (mod p). The conversation focuses on identifying special cases where determining these conditions can be simplified, particularly referencing the Jacobi symbol as a potential tool for this purpose.

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  • Understanding of modular arithmetic
  • Familiarity with prime numbers and their properties
  • Knowledge of Fermat's Little Theorem
  • Basic comprehension of the Jacobi symbol
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  • Research the Jacobi symbol and its applications in number theory
  • Explore advanced topics in modular arithmetic
  • Study algorithms for efficient prime number computation
  • Investigate the relationship between Fermat's Little Theorem and other primality tests
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Mathematicians, computer scientists, and anyone interested in number theory, particularly those focusing on prime number computations and modular arithmetic.

acarchau
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From fermat's little theorem we have for a prime to a prime p : [tex]a^{p-1}\equiv 1[/tex](mod p). Assuming p-1 to be even we must have either [tex]a^{\frac{p-1}{2}}\equiv 1[/tex] (mod p) or [tex]a^{\frac{p+1}{2}}\equiv -1[/tex] (mod p). Are there any special cases in which it is easy to determine which of the previous two conditions holds without a lot of compution?
 
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