April 2017 - Page 2

henryzz · 2017-04-04, 17:36

Quote:

Originally Posted by LaurV

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.

dleclair · 2017-04-05, 00:29

Agreed that the first two were fun but I only found out after having factored them.

LaurV · 2017-04-05, 06:42

Quote:

Originally Posted by henryzz

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...

R. Gerbicz · 2017-04-10, 14:21

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."

R. Gerbicz · 2017-05-03, 17:57

The official solution is at: https://www.research.ibm.com/haifa/p...April2017.html

bsquared · 2017-05-03, 18:41

Apparently only one person thought to interpret the factors as ASCII strings - I certainly did not.

R. Gerbicz · 2017-05-03, 19:18

Quote:

Originally Posted by bsquared

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.

a1call · 2017-05-03, 22:28

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.

a1call · 2017-05-04, 02:15

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.

bsquared · 2017-05-04, 02:25

Hex

a1call · 2017-05-04, 02:48

Quote:

Originally Posted by bsquared

Hex

Too little -> Too many possibilities

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

2017-05-03, 22:28	#19
a1call "Rashid Naimi" Oct 2015 Remote to Here/There 100000000111₂ Posts	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

2017-05-04, 02:15	#20
a1call "Rashid Naimi" Oct 2015 Remote to Here/There 3·5·137 Posts	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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2017-04-05, 00:29	#13
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2017-04-10, 14:21	#15
R. Gerbicz "Robert Gerbicz" Oct 2005 Hungary 2²×7×53 Posts	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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2017-05-03, 18:41	#17
bsquared "Ben" Feb 2007 3·1,171 Posts	Apparently only one person thought to interpret the factors as ASCII strings - I certainly did not.

2017-05-04, 02:25	#21
bsquared "Ben" Feb 2007 110110111001₂ Posts	Hex