Professor Cardy

Prime Number Calculator

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


5077 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: `5077` is 1 more than `5076` (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 `5077` is `25775929`. Subtracting 1, we get `25775928`. Note that `25775928 ÷ 24 = 1073997`.

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: `5077 = 2539^2 - 2538^2 = 6446521 - 6441444`

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: `5077 = 6^2 + 71^2 = 36 + 5041`, where `5077 = 4 × 1269 + 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: `5077` is of the form `4n+1`, where `n = 1269`.

The First 10,000 Prime Numbers