hello I am new here
 

I wanted to ask if 73786976290543239167 is prime.:smile:

Nope, 73786976290543239167 = 3391 * 12113 * 14369 * 125018321

Alex

[B]n1994[/B]

Welcome to Mersenne Forum!

You can ask us about primality of much larger numbers. :smile:

To factor small numbers (anything below 10^40 or so), google "ecm factoring". The first link is to a java applet that factors small numbers very quickly. Numbers larger than 10^40 can also be done, but may take a while (the larger the number, the longer the factoring process may take). Numbers of the size you originally asked about take seconds.
-Curtis

thanks
 

I want to ask you about
18889465931478580871167
and how do you check if its prime?

and
 

885470737341981130751

last numbers:
23611832414348226068479

[quote=n1994;128493]last numbers:
23611832414348226068479[/quote]
Please find it for yourself, using VBCurtis's instructions (below).
[quote=VBCurtis;128458]To factor small numbers (anything below 10^40 or so), google "ecm factoring". The first link is to a java applet that factors small numbers very quickly. Numbers larger than 10^40 can also be done, but may take a while (the larger the number, the longer the factoring process may take). Numbers of the size you originally asked about take seconds.
-Curtis[/quote]
[SIZE=1]c.f. vg'f cevzr[/SIZE]

[QUOTE=n1994;128493]last numbers:
23611832414348226068479[/QUOTE]You can even go here also:

[url]http://wims.unice.fr/wims/wims.cgi?module=tool/algebra/factor.en[/url]

[QUOTE=Mini-Geek;128494]Please find it for yourself, using VBCurtis's instructions (below).

[SIZE=1]c.f. vg'f cevzr[/SIZE][/QUOTE][SIZE=1]Unun, lrnu vg vf cevzr, fb rnfl gb purpx.[/SIZE]

Here's another good page to factor numbers: [url]http://www.alpertron.com.ar/ECM.HTM[/url]

Alex