Program to calculate the prime number or not for 2^n+1 where n is 3-digit number?

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Program to calculate the prime number or not for 2^n+1 where n is 3-digit number?

I tried to write the program but i am unable to store the large values for ex:2^123.

I declared the variable as long but i am unable to store the values.

Can u please suggest which datatype must use to store such a long number.

if u have any code for calculating this program please send the example code.

Thanking you
gowtham

Posted 21-Jul-10 0:42am

gowthamguptha

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Sauro Viti · Answer 1 · 2010-07-21T00:58:00

In C# the long datatype is a signed integer with 64 bit size, then it could hold up to 2^63-1.
If you use unsigned long you will be able to hold numbers up to 2^64-1.

To hold numbers greater than these, you should use some specific class or library. You can start reading this article: C# BigInteger Class[^]