mersenneforum.org Unhappy in choosing prime sequence :-)
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 2017-07-15, 17:56 #1 pepi37     Dec 2011 After milion nines:) 3×449 Posts Unhappy in choosing prime sequence :-) Whatever sequence I choose I fail to find big prime (above 1.2M digits) So right question is- to change sequence when I reach some point, or to stick with few and be patient What is your suggestion/advice ?
 2017-07-15, 18:14 #2 paulunderwood     Sep 2002 Database er0rr 3×31×37 Posts Either you can look for light or heavy k sequences. Heavy has the advantage of the tests not taking as long. You might also consider a fixed n search.
2017-07-15, 18:18   #3
science_man_88

"Forget I exist"
Jul 2009
Dumbassville

8,369 Posts

Quote:
 Originally Posted by pepi37 Whatever sequence I choose I fail to find big prime (above 1.2M digits) So right question is- to change sequence when I reach some point, or to stick with few and be patient What is your suggestion/advice ?
how are you choosing the sequence? is it a polynomial , a recurrence, a special form like Mersennes? have you narrowed down the properties that may be stopping it from working ?

2017-07-15, 18:20   #4
Batalov

"Serge"
Mar 2008
Phi(4,2^7658614+1)/2

912310 Posts

Quote:
 Originally Posted by pepi37 Whatever sequence I choose I fail to find big prime (above 1.2M digits) So right question is- to change sequence when I reach some point, or to stick with few and be patient What is your suggestion/advice ?

2017-07-15, 18:27   #5
pepi37

Dec 2011
After milion nines:)

3·449 Posts

Quote:
 Originally Posted by paulunderwood Either you can look for light or heavy k sequences. Heavy has the advantage of the tests not taking as long. You might also consider a fixed n search.
Primary I take sequences where K is 4 :)
So for last one 4*53^n+1 nash weight is 585. Also there is 4*155 and 4*212 and so on. But also there is few sequences of base 10, where also ( regardless much more weight) Ihave no luck :)
So I take various bases and various K :)

2017-07-15, 18:33   #6
pepi37

Dec 2011
After milion nines:)

54316 Posts

Quote:
 Originally Posted by science_man_88 how are you choosing the sequence? is it a polynomial , a recurrence, a special form like Mersennes? have you narrowed down the properties that may be stopping it from working ?
Gary told me in one message that sequences I choose is ordinary much harder to produce prime then "ordinary one" :)
So that may be price "I pay" :)

2017-07-15, 18:35   #7
pepi37

Dec 2011
After milion nines:)

3·449 Posts

Quote:

What else to do : make deeper sieve, and wait

 2017-07-15, 18:38 #8 pinhodecarlos     "Carlos Pinho" Oct 2011 Milton Keynes, UK 2·5·11·43 Posts be patient
2017-07-15, 18:39   #9
pepi37

Dec 2011
After milion nines:)

25038 Posts

Quote:
 Originally Posted by pinhodecarlos be patient
2:0 to be patient :)
So it must be only good answer :)

 2017-07-15, 19:53 #10 a1call     "Rashid Naimi" Oct 2015 Remote to Here/There 111100000112 Posts This reminds me of a Mork and Mindy episode where Mork goes to a bank to open an account: Teller: Name? Mork: Mork, Teller: Is that your first name or last name? Mork: Yes.

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