Friday Poser

[Oorang]

1040 is the correct answer Care to post your formula?

 

[Jon von der Heyden]

No, but I'm curious what yielded 992?

Note: Upon reflection this may not be a fair sequence, so I will leave it until noon then post the answer.

Er, I can't seem to replicate it. I confess that I never made it far enough in school to cover this sort of subject.

 

[Oorang]

Solution: (A1 Xor A2) + A1... copy down.

I was trying to see if there was a mathematic way to replicate Xor, but the formula got ridiculous and that was when I was like "hmmm that may not have been fair". (BTW extra points for anyone who knows a simple way to do that with math operators)

 

[Scott Huish]

An Excel way could be:

=(OR(A1=7,A2=9)<>AND(A1=7,A2=9))

 

[barry houdini]

For XOR perhaps

=(A1=7)+(A2=9)=1

....as for 1040 I still don't see why it should be the next in the series. My answer (1040 or 1072) was based on the logic being

n+1 = (n+/-8)*2

but I couldn't work out when it was +8 and when it was -8......

 

[Oorang]

....as for 1040 I still don't see why it should be the next in the series.

Theoretically, any formula that replicates the number sequence given would be "right". The Xor formula is just righter by virtue of being the one I used

 

[Scott Huish]

OK, what's the next number in the sequence?

1, 7, 25, 61, 121, 211, ?

 

[barry houdini]

337

 

[Scott Huish]

Yep, very good.

 

[Oorang]

Yah, but that one was google-able