Can I specify the range to search the Mersenne Prime?

Can I specify the range to search the Mersenne Prime?

[Mini-Geek]

Yes, at http://www.mersenne.org/manual_assignment/ (make sure you're logged in first to associate the reservation with your account) you can specify the exponent range you'd like to reserve.

[R.D. Silverman]

Originally Posted by Mini-Geek

Yes, at http://www.mersenne.org/manual_assignment/ (make sure you're logged in first to associate the reservation with your account) you can specify the exponent range you'd like to reserve.

Range?

A novice user should not reserve more than one number.

[rajula]

Originally Posted by R.D. Silverman

Range?

A novice user should not reserve more than one number.

It was only a bad choice of words: One can specify the range from where the exponent(s) are reserved.

Although by reserving one number you are also reserving a range consisting of one number, so...

In any case, the meaning of Mini-Geeks reply was evident once you follow the link (as the OP will obviously do).

Originally Posted by R.D. Silverman

Range?

A novice user should not reserve more than one number.

It will take a long time for testing a Mersenne Number being prime or not?

[science_man_88]

Originally Posted by Unregistered

It will take a long time for testing a Mersenne Number being prime or not?

from what I've heard here and there,it depends on the size of the exponent, if it's a LL, DC LL, TF, or P-1, the machine it's done on, and it also depends on what you call a long time.

Originally Posted by science_man_88

from what I've heard here and there,it depends on the size of the exponent, if it's a LL, DC LL, TF, or P-1, the machine it's done on, and it also depends on what you call a long time.

Just only test the M47, how long the time it will take? One day , or a week?

[LaurV]

Originally Posted by Unregistered

It will take a long time for testing a Mersenne Number being prime or not?

Depending on the exponent you choose and the hardware you have, it could take between few minutes (to prove the number composite, if you are lucky) and few years. We could help you better if you say what computer you have and what software you intend to use. If you don't know the last, then ask.

[davieddy]

Originally Posted by R.D. Silverman

Range?

A novice user should not reserve more than one number.

Originally Posted by science_man_88

from what I've heard here and there,it depends on the size of the exponent, if it's a LL, DC LL, TF, or P-1, the machine it's done on, and it also depends on what you call a long time.

Speaking personally, I'm a 60 minute man

[Brian-E]

Originally Posted by Unregistered

Just only test the M47, how long the time it will take? One day , or a week?

As LaurV writes, it depends enormously on your hardware, plus whether a Lucas Lehmer test (determining primality or compositeness) is actually necessary because no factor is found. It also obviously depends on how much of the time your machine is running: not all of us leave our machines on when they are not being used.

But a ball-park for the current wave-front of first-time Lucas Lehmer tests (typical exponent just over 50 million) ranges from a week or two for top quality hardware running 24 hours a day, through to maybe 6 months for modest hardware running only when you are using your computer. It would take me 6 months to test a 50M exponent.

Originally Posted by Brian-E

As LaurV writes, it depends enormously on your hardware, plus whether a Lucas Lehmer test (determining primality or compositeness) is actually necessary because no factor is found. It also obviously depends on how much of the time your machine is running: not all of us leave our machines on when they are not being used.

But a ball-park for the current wave-front of first-time Lucas Lehmer tests (typical exponent just over 50 million) ranges from a week or two for top quality hardware running 24 hours a day, through to maybe 6 months for modest hardware running only when you are using your computer. It would take me 6 months to test a 50M exponent.

Thank you , your answer (the second part) is what i want!