4
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You wake up in a cell after a party. You just remember the beginning of the night: you talked to your friends, you drank some alcohol, and then you blacked out.
You stand up and look around you: you are in a small empty room with no window and a door locked with a numeric keypad.

You approach the keypad and notice a piece of paper:

You'd better not try to steal my spaghetti recipe again!
I'll let you out if you can solve this puzzle:

{22,11}
{49,83}
{76,56}
{157,344}

are all acceptable numbers, but

{11,22}
{72,47}
{31,70}
{512,114}

aren't.

If you find the key, you can live. (And if you fail, my pet elephant will make sure you wish you weren't alive...).


Question:

What is the key to the puzzle?

Hint :

The key is 2-char long

(Note: This isn't a lateral-thinking question, so there's no need for ridiculous answers like "I punch through the wall".)

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  • 2
    $\begingroup$ I edited it to fix the grammar and spelling. Wasn't sure what you meant by the "key to the puzzle" (I'm guessing the pattern has some number that stands out), and I assumed a "digicode" was a keypad with numbers on it. $\endgroup$ – Deusovi Jul 28 '15 at 10:29
  • $\begingroup$ @Deusovi: Great clean up. I was itching to clean it up too, but saw that it was too much work, so I gave up. $\endgroup$ – CodeNewbie Jul 28 '15 at 10:34
  • $\begingroup$ @Deusovi well, thank you for the edit :) $\endgroup$ – The random guy Jul 28 '15 at 11:02
  • $\begingroup$ So just to confirm, the key is a single number input on the keypad? $\endgroup$ – Set Big O Jul 28 '15 at 12:39
  • $\begingroup$ So is I FALCONPUNCH through a wall still valid? $\endgroup$ – Going hamateur Jul 28 '15 at 12:55
7
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I'd do some quick addition and type

42

because each number on the left

turns into 4 if you repeatedly add digits until you get a single digit (49 -> 4+9=13 -> 1+3=4)

and each on the right

results in 2 (83 -> 8+3=11 -> 1+1=2)

In the invalid pairs, at least one of them is wrong.

Also, you know, it's the answer, assuming you know the question.

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  • 1
    $\begingroup$ Well play, well play :) $\endgroup$ – The random guy Jul 28 '15 at 13:42
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    $\begingroup$ For all that may need a hint to the answer :) 42 $\endgroup$ – Marek Oleszczuk Jul 28 '15 at 13:52
  • $\begingroup$ That's a pretty blatant hint :P $\endgroup$ – Set Big O Jul 28 '15 at 14:08
  • $\begingroup$ This makes me sad, I was adding digits and I was like of so the left needs to sum to more than the right. But that didn't hold. AAND I just shoulda paid some attention to the actual sums... (and then repeated). but gj. $\endgroup$ – Going hamateur Jul 28 '15 at 14:49
  • $\begingroup$ @Goinghamateur To be fair, I should credit qwertylpc somehow. His deleted answer led me to the idea. I just don't know how to appropriately credit deleted answers, since many users can't see it. Well, besides this roundabout way, I guess. $\endgroup$ – Set Big O Jul 28 '15 at 14:52

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