Professor Cardy

Prime Number Calculator

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


81331 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: `81331` is 1 more than `81330` (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 `81331` is `6614731561`. Subtracting 1, we get `6614731560`. Note that `6614731560 ÷ 24 = 275613815`.

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: `81331 = 40666^2 - 40665^2 = 1653723556 - 1653642225`

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: `81331` is of the form `4n-1`, where `n = 20333`.

The First 10,000 Prime Numbers