Skip to main content

GCHQ Puzzle Challenge

A special National Cipher Challenge for extraordinary times › Forums › Bureau of Security and Signals Intelligence Forum › GCHQ Puzzle Challenge

Tagged: , , , , , , , , , , , , , , , , , , , ,

Viewing 15 posts - 76 through 90 (of 194 total)
1 2 3 … 5 6 7 … 11 12 13
  • Author
    Posts
  • 25th April 2020 at 4:09 pm #47905
    Inactive

    I’m red/green colour blind so you won’t be getting an answer from me 😉

    26th April 2020 at 10:24 am #47913
    Inactive

    Not really sure about this one but as a first guess …

    45 seconds

    [Well done! Very quick, Harry]

    26th April 2020 at 3:37 pm #47915
    10degrees-admin
    Keymaster

    Challenge 4: [Yes, well done, Harry]
    58 seconds

    26th April 2020 at 3:37 pm #47916
    10degrees-admin
    Keymaster

    Maybe this? [Yes, well done, Harry]

    26th April 2020 at 3:38 pm #47917
    10degrees-admin
    Keymaster

    (With time c.1 minute! I forgot to post that.)

    26th April 2020 at 3:38 pm #47918
    Inactive

    Well it is not a integer sequence so no cheating using https://oeis.org 🙂

    26th April 2020 at 3:39 pm #47919
    10degrees-admin
    Keymaster

    [Yes, well done, Harry]

    26th April 2020 at 4:14 pm #47920
    Inactive

    Hi Harry, I suggested [Deleted by Harry] and 45 secs

    [And you were right to do so. Not sure what happened there. Apologies, will amend your original post to reflect the glory owed. Harry]

    27th April 2020 at 7:50 pm #47937
    10degrees-admin
    Keymaster

    1:17 on a white board, are white boards allowed?

    27th April 2020 at 7:51 pm #47935
    10degrees-admin
    Keymaster

    Is it … ? Not sure if it’s right, but took me around a couple of minutes.

    28th April 2020 at 12:36 pm #47953
    10degrees-admin
    Keymaster

    Did it in about 5 minutes:

    [and did it correctly, well done. Harry]

    29th April 2020 at 10:12 am #47974
    10degrees-admin
    Keymaster

    Possible hint…
    4th-1st=10th-7th

    2nd May 2020 at 8:34 pm #48050
    10degrees-admin
    Keymaster

    Is it ? Not 100% sure [Yes it is! Well done, Harry]

    3rd May 2020 at 11:46 am #48056
    10degrees-admin
    Keymaster

    Harry, now that you published the solution, I had a totally different method of going about the sequence problem. Here is is again:
    3,3,10,11,11,18,10,10,17, …
    I noticed that 11-3=8 and 10+8=18. Furthermore, 10-11=-1 and 18+-1 is 17. Also, I noticed that the doubled ten followed on from a single ten. So I reasoned that the next doubled number would be 18. Carrying this pattern on, I got 18-10=8. 8+17=25. Therefore, the next terms of the sequence are 18,18,25…

    More than one way to crack a nut!

    3rd May 2020 at 11:47 am #48057
    Harry
    Keymaster

    Very nice! Thanks for this. Harry

  • Author
    Posts
Viewing 15 posts - 76 through 90 (of 194 total)
1 2 3 … 5 6 7 … 11 12 13
  • You must be logged in to reply to this topic.
FAQs Challenges Follow Us