[quote=n1994;128569]thanks last problem' can i copy anumber into it with out writing it[/quote]
I...told...you...how...to...paste...
Once you copy it (you can copy it from this thread, if you like), after you've put the "isprime(" (or "factor(" or "ispseudoprime(" or whatever other command), click the C:\ icon in the upper left of the GP window, go to Edit, and click Paste.

I think there's a language barrier here, which seems to be what is causing much of the problem.

n1994, what is your native language?

We have people from everywhere in the forum so if you'd like to converse with someone by private message in something other then English, that might help a lot.

For my own curiosity, for the original numbers shown here that no one has posted the factors for, I looked at them using Alpterton's site that was posted by akruppa that I have used many times in the past:

18889465931478580871167 = 7 * 31 * 151 * 2092667 * 275475431603
885470737341981130751 is prime
23611832414348226068479 is prime

-and-

[code]
67039039649712985497870124991029230637396829102961966888617807218608820150367734884009371490834517138450159290932430254268769414059732849732168245030420479 = 691 * 8941 * 10850847054717278375941288856151417879551093039894747685642995093354201251194352377567198683706471502676115427042535355875940769139213611425692604409
[/code]

Two communication issues here:

1. The 149-digit factor is a PROVEN prime, not just a probable prime. I think that is what N1994 was asking when he said "r you sure its not prime" in response to bsquared saying it was a (probable) prime.

2. When N1994 said it was a 149-digit number, it was the factor he was referring to, not the original 155-digit number.

So in response to the N1994 post of 11 Mar 08 at 7:44 PM GMT, yes the FACTOR is 149 digits and that factor IS prime! :smile:

-and-

[code]
161585030356555036503574383443349759802220513348577420160651727137623275694339454465986007057614567318443589804609490097470597795752454605475440761932241415603154386836504980458750988751948260533980288191920337841383961093213098780809190471692380852352908229260181525214437879457705329043037761995619651927609571666948341712103424873932822847474280880176631610290389028296655130963542301570751292964320885583629718018592309286787991755761508229522018488066166436156135628423554101048625785508634656617348392712903283489675229986341764993191077625831947186677718010677166148023226592393024760740967779268055297981153279 = 7951 * 178691 * 1142891 * 11056621 * C595
[/code]
C595 = 595-digit composite factor. Tested to curve 30 on Alperton's site.

Edit: Like most everyone else, I'm STILL curious where N1994 is getting these numbers from!


Gary