# A batch of four sequence puzzles

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.

• The prize goes to Len, since he solved the last and thus hardest sequence. – Alexis Feb 28 '15 at 13:58

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

• Oh, come on, this is getting ridiculous. +1 for digging that up though. – dmg Feb 27 '15 at 12:23
• @dmg - Thanks, I agree. I think this recent question was intended to be a clue ;-) – Len Feb 27 '15 at 12:33
• 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). – Gamow Feb 27 '15 at 12:37

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:

The complete sequence is: S, A, Q, T, B, F, B, R, A, R, V.

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, ...

• 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. – dmg Feb 12 '15 at 14:33
• Interesting observation! I too think that the OP has made a mistake on that. – Spikatrix Feb 12 '15 at 14:37
• 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 – Gamow Feb 12 '15 at 14:48
• dmg is right. I had made a mistake. I have corrected it. Thanks for pointing it out! – Alexis Feb 14 '15 at 16:30