Professor Cardy

Prime Number Calculator

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Enter an integer (max. 1,000,000)


85427 is a prime number.

About the Calculator

This calculator performs the decomposition of a number into its prime factors and lists all its natural divisors. Enter an integer between 1 and 1,000,000.

Curiosities

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: `85427` is 1 less than `85428` (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 `85427` is `7297772329`. Subtracting 1, we get `7297772328`. Note that `7297772328 ÷ 24 = 304073847`.

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: `85427 = 42714^2 - 42713^2 = 1824485796 - 1824400369`

4) 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: `85427` is of the form `4n-1`, where `n = 21357`.

The First 10,000 Prime Numbers