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Q: What two prime numbers are multiplied and equal 400?

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You will need to multiply six prime numbers to obtain 400: 400 = 5*5*2*2*2*2

400

Yes.

I'm sure there are more than 2 prime numbers that are 400 digits long.

20 and 20

There is only one number that equals 400. The number is 400, and it's not a prime number.

Mutliplied two prime numbers to get 400?

400 multiplied by 500 is 200,000.

500 multiplied by 400 is 200,000.

20 multiplied by 20 is 400.

No.

The prime numbers (factors) of 400 are: 2 and 5

2 and 5 400 = 2 x 2 x 2 x 2 x 5 x 5

Any two prime numbers, of about 200 digits each, would work.Any two prime numbers, of about 200 digits each, would work.Any two prime numbers, of about 200 digits each, would work.Any two prime numbers, of about 200 digits each, would work.

It is: 9*43 = 387

The numbers are 1,000 and 400.

The sum of all prime between numbers 1 and 400 (2 through 399) is 13,887.

You seek for prime numbers that are approximately 200 digits big, then multiply them. I don't know details about the algorithms, but I understand that for cryptography, instead of using an algorithm that will be guaranteed to give a prime number, an algorithm is used, instead, that has a very, very high probability of giving a prime number. Probably this is done because it is faster.

400 to 500

307,311,313,317,331,337,347,349,353,359,367,373,379,383,389,397

The happy prime numbers between 300 and 400 are as follows:313, 331, 367, 379, 383, 397

The prime factors are: 2, 5

The numbers 353, 359, 367, 373, 379, 383, 389 and 397 are prime.

2 and 5 are the two different prime factors of 400. The prime factorization of 400 is 2 x 2 x 2 x 2 x 5 x 5.

400 and 901