Prime Number Calculator

1) Relation to multiples of 6: Every prime number greater than 3 is always one less or one more than a multiple of 6.
Example: `28181` is 1 less than `28182` (multiple of 6).

2) Square minus 1 divisible by 24: For every prime number greater than 3, if 1 is subtracted from its square, the result is always divisible by 24.
Example: The square of `28181` is `794168761`. Subtracting 1, we get `794168760`. Note that `794168760 ÷ 24 = 33090365`.

3) Difference of squares: Every prime number greater than 2 can be expressed as the difference of the squares of two consecutive natural numbers.
Example: `28181 = 14091^2 - 14090^2 = 198556281 - 198528100`

4) Sum of two squares: Every prime number of the form `4n+1` (where n is a positive natural number) can be expressed as the sum of two squares.
Example: `28181 = 25^2 + 166^2 = 625 + 27556`, where `28181 = 4 × 7045 + 1`.

5) Form `4n+1` or `4n-1`: Except for the number 2, all prime numbers follow the pattern `4n+1` or `4n-1`, where `n` is a natural number.
Example: `28181` is of the form `4n+1`, where `n = 7045`.