P-1 finding multiple factors at once?

mnd9 · 2019-12-04, 14:15

I hadn't seen this happen before but it seems a P-1 I recently ran found two factors simultaneously:

https://www.mersenne.org/report_expo...7375339&full=1

At first I was excited that I found a huge ~140 bit factor (this is how the result was reported). I wasn't aware that this would happen so just found it interesting...

masser · 2019-12-04, 15:37

Nice find!

Same thing happened to me recently:

https://mersenneforum.org/showpost.p...4&postcount=33

petrw1 · 2019-12-04, 16:27

Its not that uncommon.
I've had several cases where the P-1 "factor" found turns out to be composite.

2019-12-04, 14:15	#1
mnd9 Jun 2019 Boston, MA 3·13 Posts	P-1 finding multiple factors at once? I hadn't seen this happen before but it seems a P-1 I recently ran found two factors simultaneously: https://www.mersenne.org/report_expo...7375339&full=1 At first I was excited that I found a huge ~140 bit factor (this is how the result was reported). I wasn't aware that this would happen so just found it interesting...

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2019-12-04, 15:37	#2
masser Jul 2003 wear a mask 1,657 Posts	Nice find! Same thing happened to me recently: https://mersenneforum.org/showpost.p...4&postcount=33

2019-12-04, 16:27	#3
petrw1 1976 Toyota Corona years forever! "Wayne" Nov 2006 Saskatchewan, Canada 2²×7×167 Posts	Its not that uncommon. I've had several cases where the P-1 "factor" found turns out to be composite.