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This is my fourth batch of sequence puzzles that are nasty and hard to solve; yet, each of them has a clear and justifiable solution.

Sequence 1:
2, ?, ?, ?, 0, 3, 7, 6, 4, 6, 9, 0, ?, 0, 4, 3, 4, 9, 5, 7, 3, 7, 5, 4, 4, 9, 4, 3, ...

Sequence 2:
Lt, Hd, Tu, Wk, ??, Gbb, Ak, M-kb

Sequence 3:
??, ??, ??, 2, 67, 62, 27, 14

Sequence 4:
S, ?, ?, ?, B, F, B, R, A, R, V.

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  • $\begingroup$ The prize goes to Len, since he solved the last and thus hardest sequence. $\endgroup$
    – Alexis
    Commented Feb 28, 2015 at 13:58

3 Answers 3

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Sequence 2 is the list of:

UN Secretary Generals - with their initials reversed
Trygve Lie, Dag Hammarskjöld, U Thant, Kurt Waldheim, Javier Pèrez de Cuèllar, Boutros Boutros-Ghali, Kofi Annan, Ban Ki-moon

So the full sequence is:
Lt, Hd, Tu, Wk, Cdpj, Gbb, Ak, M-kb

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  • $\begingroup$ Oh, come on, this is getting ridiculous. +1 for digging that up though. $\endgroup$
    – dmg
    Commented Feb 27, 2015 at 12:23
  • $\begingroup$ @dmg - Thanks, I agree. I think this recent question was intended to be a clue ;-) $\endgroup$
    – Len
    Commented Feb 27, 2015 at 12:33
  • $\begingroup$ Good, this bugged me a long time. One more off from my list. (On a similar note: I have solved puzzling.stackexchange.com/questions/8625/whats-my-room-number because I noted the author's obsession with chemical puzzles). $\endgroup$
    – Gamow
    Commented Feb 27, 2015 at 12:37
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This time I could google sequence 3.

Sequence 3:

Moon fact sheet: Metric Number of Moons:
0, 0, 1, 0, 2, 67, 62, 27, 14, 5
(so the three questionmarks are 0, 0, 1 for Mercury, Venus, Earth)

Added February 17. I think I have finally found the answer to sequence 4.

Sequence 4:

summary, answers, questions, tags, badges, favorites, bounties, reputation, activities, responses, votes
The complete sequence is: S, A, Q, T, B, F, B, R, A, R, V.

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Sequence 1:

To get each number in this sequence, add 1 to each digit of Pi(after the decimal point) and if it is 10, use 0(mod 10).

So, The full sequence is

2,5,2,6,0,3,7,6,4,6,9,0,8,0,4,3,4,9,5,7,3,7,4,3,3,9,4,3, ...

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    $\begingroup$ You will not get the "4,3,3,9,4,3, ..." at the end if you add one. You will get "5,4,4,9,4,3, ...". I'm gonna blame it on OP for now. $\endgroup$
    – dmg
    Commented Feb 12, 2015 at 14:33
  • $\begingroup$ Interesting observation! I too think that the OP has made a mistake on that. $\endgroup$
    – Spikatrix
    Commented Feb 12, 2015 at 14:37
  • $\begingroup$ I was just a little bit too slow on this one. Google found me a Spanish web page with part of this sequence, but I was not able to deduce the solution from it: matematicasaureas.blogia.com $\endgroup$
    – Gamow
    Commented Feb 12, 2015 at 14:48
  • $\begingroup$ dmg is right. I had made a mistake. I have corrected it. Thanks for pointing it out! $\endgroup$
    – Alexis
    Commented Feb 14, 2015 at 16:30

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