## The comeback of brainteasers

Anything goes, but keep it seemly...

### The comeback of brainteasers

Not sure if the folks here are ready for it, but anyway let's give it a try:

Brainteaser #1:

Why is 6842075193 a special number?

The correct answerer will get the right to post the next brainteaser, if he/she likes to.
udosuk

Posts: 2698
Joined: 17 July 2005

At first glance, it has all the DECIMAL digits...Left even & Right odd.

tarek

tarek

Posts: 2907
Joined: 05 January 2006

It's almost what I found
In addition, I've noticed that :
7-5=2
5-1=4
1-9=-8
9-3=6
but so what

JPF
JPF
2017 Supporter

Posts: 3754
Joined: 06 December 2005
Location: Paris, France

JPF wrote:It's almost what I found
In addition, I've noticed that :
7-5=2
5-1=4
1-9=-8
9-3=6
but so what

well isn't that the mirror image of what is on the left

tarek

tarek

Posts: 2907
Joined: 05 January 2006

Well spotted Tarek, but it's off track I'm afraid.

75193 is interesting in a bizarre way, but that wasn't what Matt was after either.
Glyn

Posts: 357
Joined: 26 April 2007

tarek wrote:... it has all the DECIMAL digits ...

This observation from tarek is relevant!

Triple click to see another minor hint I wrote:By reversing the number (3915702486), it is still special no less.

I'll post a major hint after the Cavs-Celtics NBA game later tonight! LBJ vs RA+PP+KG, I wonder who'll win?
udosuk

Posts: 2698
Joined: 17 July 2005

"Decimal" made look for anothe base number to make some sense out of it (i.e. 6842075193 in x-decimal will turn out to be 9999999 or similar striking number).

but there are other interesting things that caught my eye.
start from ends & work inwards shifting from left to right...

3+6 =9
9-8= 1
1+4 =5
5+2 =7

but I guess it falls short of being a good answer

tarek

tarek

Posts: 2907
Joined: 05 January 2006

Lots of weirdity here, most of it useless I guess.

From the front
3*6 mod 10=8
3*8 mod 10=4
3*4 mod 10 =2

From the back
3^2 mod 10=9
9^2 mod 10 =1

By the way 75193 is the largest number constructable from disjoint odd digits with disjoint differences between neighbouring and next-neighbouring digits.
Glyn

Posts: 357
Joined: 26 April 2007

Triple click to read the major hint I wrote:The other day I went to a town called Rebmun to visit my aunt Slaremun Cibara-Udnih & her husband Stigid Lamiced. Their 2 youngest kids, Net & Nevele came out to greet me. I asked them where were their elder brothers & sisters, and they told me they're lining up for a group photo.

Pretty ugly game tonight.
udosuk

Posts: 2698
Joined: 17 July 2005

After seeing Matt's megaclue elsewhere here's a piece of info that might help without revealing as much.

In France 2678309541 would be considered special.
Glyn

Posts: 357
Joined: 26 April 2007

does this special number correspond to a moment in time ?

tarek

tarek

Posts: 2907
Joined: 05 January 2006

Nothing to do with time

In Germany the special number is 8649702351. Funny how it changes in different countries.
Glyn

Posts: 357
Joined: 26 April 2007

Glyn wrote:In France 2678309541 would be considered special.

My French knowledge tells me it should be 2678350194.

tarek wrote:does this special number correspond to a moment in time ?

Not really.
udosuk

Posts: 2698
Joined: 17 July 2005

something to do with the numbers written with letters :

zero, one, two, three, ...
zero, un, deux, trois, ...
zero, eins, zwei, drei, ...

JPF
JPF
2017 Supporter

Posts: 3754
Joined: 06 December 2005
Location: Paris, France

zero, one, two, three, ...
zero, un, deux, trois, ...
zero, eins, zwei, drei, ...

null in German, I think.
Bigtone53

Posts: 413
Joined: 19 September 2005

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