What are two prime numbers when multiplied would generate a 400 digit number?

Answer 1

The following is a link to a calculator which will generated large prime numbers as well as multiply huge numbers together:
http://world.std.com/~reinhold/BigNumCalc.html

716111958663682417342303150142 608858901789417310093684696588 037024637209566331209352948311 017575749961619319828641955426 693304570465688762892415366806 836017495077860594429200032782
63334056542642264651

X

580216645856397911811840259504 402483982261360695169382324936 875058224718365368242988227337 103422506977399968259382326419 406708576245141031259861340509 976971601273015479957884681378
87651823707102007839

=

415500078713497281558905442483 784251718409580288016708180261 624957845916174034681385215800 377996269949769240101176290536 233429600607265291665503850867 426580947888398820550079218757 303625094649132652959885439006 834654658500398125929731018350 466670499118257135230989594968 432239652495895326959857212205 024845334097138922197109779294 150585092298147887850145072541 456311267636214499699970863002
4114599189

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You can also use this site if you just want the prime numbers:
http://primes.utm.edu/lists/small/small2.html#200
You would want to pick two that are 200 digits long and such that the product of the first two digits is 2 digits long.

Answer 2

I don't know how you would figure this out, because the two prime numbers would be very large. The number of digits of each prime multiplied times each other would have to be 400. So the two primes could be both 20 digits long, or one could be 10 and the other 40, etc.

You might be able to find 20 digit primes using a computer program.

Answer 3

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