20080314, 22:00  #1 
Mar 2008
11_{16} Posts 
is this prime?
IM NOT SURE IS THIS NUMBER PRIME?

20080314, 22:07  #2  
Account Deleted
"Tim Sorbera"
Aug 2006
San Antonio, TX USA
17·251 Posts 
Please find it on your own. I know it, and it's easy to find, you really don't need to post here for this. I'll repeat my instructions, just to be sure you have them:
Quote:
Quote:
Pari/GP can find the primality of a number that size easily, use isprime(x). 

20080314, 22:16  #3 
Mar 2008
10001_{2} Posts 
ok 'my problem is that it doesnt work
i put a number in and instead of writing if its prime or not it writes the order(if i write foe example 4 in the first time it will writ me 1)

20080314, 22:29  #4  
Account Deleted
"Tim Sorbera"
Aug 2006
San Antonio, TX USA
10AB_{16} Posts 
Quote:
(after running the same command again) %2 = 0 Is this the sort of thing you're talking about? It's saying "%1", a reference for you to use in later formulas to reference this output, "= 0" meaning not prime (0 for not prime, 1 for prime). If you're saying it prints something like (assuming you're trying to check 11 for primality) "%1 = isprime11", then you need to put the parentheses around it so it knows you're telling it a command and not saying a name of a new variable or something. Edit: Try typing isprime(11) and see if it returns "%1 = 1". Last fiddled with by MiniGeek on 20080314 at 22:31 

20080314, 22:34  #5 
Mar 2008
17 Posts 
no it returns %6=(11)
it says six because its the 6 number i tried 
20080314, 22:36  #6 
Mar 2008
21_{8} Posts 
never mind it works thanx but it doesnt check big numbers
(more then a 100 digits also) Last fiddled with by n1994 on 20080314 at 22:37 
20080314, 22:43  #7  
Account Deleted
"Tim Sorbera"
Aug 2006
San Antonio, TX USA
17×251 Posts 
Quote:


20080314, 22:45  #8 
Mar 2008
17 Posts 
no im doing what you said isprime(x) but it "cuts" the nuber where the programs end instead of writing the hole number it makes it shorter.

20080314, 23:01  #9 
Account Deleted
"Tim Sorbera"
Aug 2006
San Antonio, TX USA
17×251 Posts 

20080314, 23:08  #10 
Mar 2008
11_{16} Posts 
no that works fine now it returns 1 but if u put a big number it makes it shorter

20080314, 23:11  #11 
Account Deleted
"Tim Sorbera"
Aug 2006
San Antonio, TX USA
4267_{10} Posts 
So isprime(11) returns "1" but if you paste a number instead of typing "11", it returns the full number? Try copying "11", then doing it just like you'd paste a larger number (making sure the command stays "isprime(11)") and double check that it returns "1". Then copy a large number, making sure you have "isprime(" before it and then typing ")" after it, and see if it returns 0 or 1 or something else.

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