7
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Here is my first try at a puzzle. Find the missing number.

            7
          5 2 6
        2 0 9 7 6
      1 4 2 7 6 7 9
    4 7 6 3 3 2 6 9 8
  5 1 9 2 7 6 6 9 8 2 8 
6 1 6 5 3 2 9 7 9 7 8 6 ?

Hint:

the title is a hint

Hint:

almost half of the numbers should be discarded!

Hint:

you are not looking for a number at all but a hidden text

Hint:

Numbers come in pairs

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  • $\begingroup$ Right triangle 90 degrees then take out the 0 and left with 9? $\endgroup$ – Duck Aug 10 '18 at 17:39
  • $\begingroup$ I think this puzzle is way too hard. Added another hint :) $\endgroup$ – filip Aug 10 '18 at 17:48
  • $\begingroup$ I don't know if this changes anything, but is it a Isosceles triangle? @filip $\endgroup$ – QuantumTwinkie Aug 10 '18 at 17:54
  • $\begingroup$ @Duck Thats a bingo! $\endgroup$ – filip Aug 10 '18 at 18:11
  • 1
    $\begingroup$ I've been totally stuck for 5 days, but this last hint really helped @filip! Great puzzle :) $\endgroup$ – El-Guest Aug 15 '18 at 15:25
2
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The missing number is

9.

This is because when you

Take the right half of the triangle numbers, you are left with a sequence as follows: 72 69 76 76 79 32 69 86 69 82 89 79 78 6? when you group them into pairs.

When

translating ASCII codes to symbols, you get the phrase HELLO EVERYON?. The question mark should obviously be an E, which translates to ASCII code 69, meaning the question mark ought to be a 9.

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  • $\begingroup$ YES! Great job, this one was very dififcult :D $\endgroup$ – filip Aug 15 '18 at 15:30
  • $\begingroup$ Thanks! The last hint was a lifesaver, wouldn't have gotten anywhere without it! :D $\endgroup$ – El-Guest Aug 15 '18 at 15:40
0
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Discard the left half but keep the middle column. I kind of identified two patterns and therefore I think it can be a 5, if not a 7

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