how to test?

can u help me how to test if there's any prime number between 2^127-1 and 2^521-1?
thans for any help :)

I found a prime number solver which let's you find prime numbers between two values. http://www.mitwhiz.com/math/primes.html

If you however enter the two values you mention. You will be waiting approximately ten millenniums before the test finishes :D

Quote:

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Originally posted by phanbachloc
can u help me how to test if there's any prime number between 2^127-1 and 2^521-1?
thans for any help :)

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since 2⁵²¹-1 is greater than twice the size of
2¹²⁷ - 1, I am extremely confident that there are primes between the two.

Given any Number N, It seems that there is always at least 1 prime between N and 2N, when N >= 2.

If you are interested in primes, the following site may appeal to you:
http://www.utm.edu/research/primes