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Old 2017-04-04, 17:36   #12
henryzz
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Quote:
Originally Posted by LaurV View Post
yes, yafu's defaults, and ECM set to custom plan 30% (my defaults for aliquotes, to avoid as much as possible 3-way splits in nfs). As I said, unlucky.
edit: we can share logs after the competition ends.
I meant factor them after knowing the factors to see what was needed to find factors using the P+-1 methods.
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Old 2017-04-05, 00:29   #13
dleclair
 
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Agreed that the first two were fun but I only found out after having factored them.
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Old 2017-04-05, 06:42   #14
LaurV
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Quote:
Originally Posted by henryzz View Post
I meant factor them after knowing the factors to see what was needed to find factors using the P+-1 methods.
Oh, you mean factor the factors (or well.. their non-prime neighbors). Haha, it didn't occur to me. You are right...
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Old 2017-04-10, 14:21   #15
R. Gerbicz
 
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"Robert Gerbicz"
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There is an update:

"Update (10/4): Hint: The challenge is solvable in seconds of CPU time. The Bonus requires some creative view, but can be solved in seconds too."
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Old 2017-05-03, 17:57   #16
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The official solution is at: https://www.research.ibm.com/haifa/p...April2017.html
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Old 2017-05-03, 18:41   #17
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Apparently only one person thought to interpret the factors as ASCII strings - I certainly did not.
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Old 2017-05-03, 19:18   #18
R. Gerbicz
 
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Quote:
Originally Posted by bsquared View Post
Apparently only one person thought to interpret the factors as ASCII strings - I certainly did not.
Not necessarily. He writes only that: "Armin Krauß was the first to send us the ASCII strings and got a second '**' for that." so it is possible that someone also found it after Armin, but received no 2nd star.
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Old 2017-05-03, 22:28   #19
a1call
 
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I seem to be getting a js error on both my iPhone and my PC, when leading the link.
What needs to be reversed?
Is it a mirror of decimal expansion of one of the first 2 numbers or any off their factors or something else.
Thank you for any clarification.

Last fiddled with by a1call on 2017-05-03 at 22:29
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Old 2017-05-04, 02:15   #20
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I just tried reversing the characters of all 3 composites and all 3 factors of the 1st two composites. They all have a GCD = 1 related to 3rd composite.

Last fiddled with by a1call on 2017-05-04 at 02:19
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Old 2017-05-04, 02:25   #21
bsquared
 
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Hex
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Old 2017-05-04, 02:48   #22
a1call
 
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Quote:
Originally Posted by bsquared View Post
Hex
Too little -> Too many possibilities

(Hex to decimal - Decimal to hex - reverse characters - don't reverse characters) x 6
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