Professor Cardy

Prime Number Calculator

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


56401 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: `56401` is 1 more than `56400` (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 `56401` is `3181072801`. Subtracting 1, we get `3181072800`. Note that `3181072800 ÷ 24 = 132544700`.

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: `56401 = 28201^2 - 28200^2 = 795296401 - 795240000`

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: `56401 = 76^2 + 225^2 = 5776 + 50625`, where `56401 = 4 × 14100 + 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: `56401` is of the form `4n+1`, where `n = 14100`.

The First 10,000 Prime Numbers