Question: How to calculate exponential mod function: Examples: 4^3 mod 23 = 18. 21^6 mod 23 = 18 7^18 mod 23 = 18. Advice simple description

How to calculate exponential mod function:

Examples:

4^3 mod 23 = 18.

21^6 mod 23 = 18

7^18 mod 23 = 18.

Advice simple description on how above is calculated, if i run this directly on my calculator exanple:: 21^6 mod 23 , output is long and differs from above answer.

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