Professor Cardy

Prime Number Calculator

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


59929 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: `59929` is 1 more than `59928` (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 `59929` is `3591485041`. Subtracting 1, we get `3591485040`. Note that `3591485040 ÷ 24 = 149645210`.

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: `59929 = 29965^2 - 29964^2 = 897901225 - 897841296`

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: `59929 = 148^2 + 195^2 = 21904 + 38025`, where `59929 = 4 × 14982 + 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: `59929` is of the form `4n+1`, where `n = 14982`.

The First 10,000 Prime Numbers