Professor Cardy

Prime Number Calculator

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


36923 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: `36923` is 1 less than `36924` (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 `36923` is `1363307929`. Subtracting 1, we get `1363307928`. Note that `1363307928 ÷ 24 = 56804497`.

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: `36923 = 18462^2 - 18461^2 = 340845444 - 340808521`

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: `36923` is of the form `4n-1`, where `n = 9231`.

The First 10,000 Prime Numbers