Using Fermat’s Little Theorem, show that 830 -1 is divisible by 31.

8 a] Using Fermat’s Little Theorem, show that 830 -1 is divisible by 31.

One comment

  1. 8^30 -1 is Divisible by 30
    According to Fermat’s little theorem
    (1-p) !
    8²=64=2 mod 31
    8⁴=4 mod 31
    8^8 = 16 mod 31
    8^16 = 8 mod 31
    8^30=8^16 ×8^8×8⁴×8²
    = 8×16×4×2
    = 1024 ~= 1 mod 31

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