Professor Cardy

Prime Number Calculator

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


94121 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: `94121` is 1 less than `94122` (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 `94121` is `8858762641`. Subtracting 1, we get `8858762640`. Note that `8858762640 ÷ 24 = 369115110`.

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: `94121 = 47061^2 - 47060^2 = 2214737721 - 2214643600`

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: `94121 = 136^2 + 275^2 = 18496 + 75625`, where `94121 = 4 × 23530 + 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: `94121` is of the form `4n+1`, where `n = 23530`.

The First 10,000 Prime Numbers