Challenge

[retina]

Originally Posted by science_man_88

if you look at wikipedia the double mersenne primes go:

7, 127, 2147483647, 170141183460469231731687303715884105727
first all of them end in 7
next if you look at the table for mersenne primes they have:

p Mp
3 7
7 127
127 170141183…884105727

If I'm right in assuming the last Mp is the last in this series and this pattern continues( the pattern is Mp becomes the next p) then the next one in this sub series( or what ever you want to call it) is:

p
170141183460469231731687303715884105727

Mp
2^170,141,183,460,469,231,731,687,303,715,884,105, 727-1


if this is true it smashes all records as the biggest prime to date and biggest mersenne prime is 2^46 million and something this is 2^ 170 Undecillion and something.

I left gimps as it took to much time for me. but can anyone confirm this pattern or try it out if so it would be the biggest known prime.

Yes indeed, you are correct, there is pattern.

Here is another pattern. 3, 5, 7, ... all prime numbers. Do you see the pattern? Just add 2 each time.

... so that means that 9, 11, 13, 15, ... are also prime numbers.

Basically, patterns in prime sequences are meaningless. Humans like to see patterns wherever possible but that does not mean the pattern is really there, it just means that someone sees a pattern.

[Dougal]

flouran i think its debatable at the minute,but the amount of posts he is posting would lead me to believe he is.

[science_man_88]

retina I think you need a definition of prime as neither 9 or 15 is prime in the sequence you listed off.

[flouran]

Originally Posted by science_man_88

retina I think you need a definition of prime as neither 9 or 15 is prime in the sequence you listed off.

That was retina's point....
Reread his post again, please.

[science_man_88]

I'm not saying it is like he's said in his post I'm just saying it works for the series of possibilities.

[flouran]

Originally Posted by Dougal

flouran i think its debatable at the minute,but the amount of posts he is posting would lead me to believe he is.

Just because he posts frequently doesn't mean he is necessarily a crank; I think it is just "new-user syndrome"

I think this is his Twitter page, perhaps something regarding his "crankishness" can be discerned from here:
http://twitter.com/science_man_88

[cheesehead]

Originally Posted by science_man_88

if you look at wikipedia the double mersenne primes go: < snip >

science_man_88,

Apparently you're a bit new here.

I just spent a lot of time posting a detailed answer to your essentially-the-same post in thread http://mersenneforum.org/showthread.php?p=185859

Now I discover this thread.

Please try not to post the same inquiry in two different threads. First think about whether your posting is really relevant to a thread, if you consider posting in an already-existing thread. If not, start a new thread (as you did here) without posting in the already-existing thread (which you had also done).

But if you've already posted your inquiry in an already-existing thread, then you duplicate that inquiry in a new thread (or *shudder* another already-existing thread) then at least go back ASAP and post a message in the thread where you first posted -- that you've started a new, separate thread with the same inquiry!

Also, mention in the new thread's initial post that it duplicates what's already posted in the previous thread! See, if you had done that here, then other folks who discovered your inquiry here first instead of in the other thread first as I did could've checked the other thread and put the new-thread notice there for you.

But since you didn't mention in either post that you'd duplicated your inquiry, I wasted my time in the other thread.

I like helping new folks, but I don't like wasting my time.

[10metreh]

http://primes.utm.edu/mersenne/index.html#unknown

This problem has been investigated before. MM127 may be prime, but we currently cannot tell. We might be able to prove it isn't prime by finding a factor.

[science_man_88]

sorry I'm new here and I don't remember posting it before as I haven't been on in a long while

[10metreh]

Originally Posted by science_man_88

sorry I'm new here and I don't remember posting it before as I haven't been on in a long while

That was actually yesterday. Surely you remember?

[cheesehead]

Originally Posted by science_man_88

sorry I'm new here and I don't remember posting it before as I haven't been on in a long while

Very well. Now that I think of it, I've probably done the same -- post in one thread, then forget I'd done so a short time later.