mersenneforum.org Efficient testing in Pfgw
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 2016-04-30, 04:33 #1 Trejack   998510 Posts Efficient testing in Pfgw Is there a way to test two files, or prp test two different values in pfgw? (and I will get to my problem in a second) I am looking for a prime quadruplet of the form k*2^255-1, k*2^255+1, k*2^255+5, k*2^255+7. Would I be able to efficiently single-test this sequence (or combine these files, with one varible): ABC2 $a*2^255-1 a: from 1 to 10000000000 ABC2$a*2^255+1 a: from 1 to 10000000000 ABC2 $a*2^255+5 a: from 1 to 10000000000 ABC2$a*2^255+7 a: from 1 to 10000000000 and get a single result like this: k*2^255-1 is a 3-PRP! (time here) k*2^255+1 is a 3-PRP! (time here) k*2^255+5 is a 3-PRP! (time here) k*2^255+7 is a 3-PRP! (time here) And only getting results if the sequence is a prime quadruplet (or some other type). Okay for me if this is not possible, but I want to check that no one else made a dual sieve file for this before I start writing my own script for this. Thanks if there was already a dual sieve file for this.
 2016-04-30, 05:13 #2 axn     Jun 2003 4,969 Posts Have you looked in the abcfileformats.txt for the "&" and "|" operators?
 2016-04-30, 05:30 #3 Batalov     "Serge" Mar 2008 Phi(4,2^7658614+1)/2 22·7·337 Posts Also, consider that if you will sieve with quad option in NewPGen (option 15), then PFGW will test the candidate quads from the candidate file more or less exactly how you want it: only once if quad member #1 is composite, two tests if chain member #1 is prime and #2 is composite and so on. It will run four tests and will report "- Complete Set -" only when all four will be prime. Hint for TL;DR type of readers. You want this header [B]ABC $a*2^255-1 &$a*2^255+1 & $a*2^255+5 &$a*2^255+7[/B] 147039 255 248349 255 374244 255 436854 255 810654 255 1355484 255 1493034 255 ... or equivalently [B]4519421172:T:1:2:18563[/B] 147039 255 248349 255 374244 255 436854 255 810654 255 1355484 255 1493034 255 ...

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