I have this puzzle I'm working on. I'm not sure what kind of puzzle it is, but it may be initials of something in the UK. The puzzle was created some time between 1978 and 1995.
The letters form a sequence which I have to complete:
A
H
AA
BL
DU
HH
ME
SR
?
So far I've tried London underground stations, train stations, famous monuments and vehicle registration codes. BL could be British Library? The vehicle registration match the letters but I still can't solve the sequence. I'm not absolutely sure I'm on the right track so any assistance would be great!
Here's a website for the VReg codes: http://www.wolfbane.com/vreg.htm
Thanks.
Help with letter puzzle
Re: Help with letter puzzle
I put the solution in three parts in case you want to try and figure each part for yourself.
For future reference, the source of the puzzle would be (by far) the best info to give.
azzey  You're lucky, this time.
First, a huge clue:
Then, the technique:
Then, the solution:
For future reference, the source of the puzzle would be (by far) the best info to give.
azzey  You're lucky, this time.
First, a huge clue:
PRIME_BBCODE_SPOILER_SHOW PRIME_BBCODE_SPOILER:
Considering A = 1, B = 2, C= 3 ... helps to solve this
Obviously A = 1, H = 8.
Note, the sequence appears to be counting upward (the letters appear first in order of length, then in alphabetical order).
Obviously A = 1, H = 8.
Note, the sequence appears to be counting upward (the letters appear first in order of length, then in alphabetical order).
PRIME_BBCODE_SPOILER_SHOW PRIME_BBCODE_SPOILER:
Consider counting with the alphabet  but after Z = 26, you have AA = 27, AB = 28, AC = 29,... coincidentally, the same way that Microsoft Excel counts columns.
This is essentially then a 'Base 26' counting system, with 26s and Units  rather than Tens and Units
Then
AA = 1*26 + 1 = 27
BL = 2*26 + 12 = 64
DU = 4*26 + 21 = 125
and so on
This is essentially then a 'Base 26' counting system, with 26s and Units  rather than Tens and Units
Then
AA = 1*26 + 1 = 27
BL = 2*26 + 12 = 64
DU = 4*26 + 21 = 125
and so on
PRIME_BBCODE_SPOILER_SHOW PRIME_BBCODE_SPOILER:
1,8,27,... are recognisably cube numbers (1 cubed, 2 cubed, 3 cubed, where 2 cubed = 2*2*2)
The answer is therefore 9 cubed = 729.
This is bigger than ZZ = 702, so we need a third letter (AAA = 703, AAB = 704,...).
The answer is ABA.
The answer is therefore 9 cubed = 729.
This is bigger than ZZ = 702, so we need a third letter (AAA = 703, AAB = 704,...).
The answer is ABA.
Re: Help with letter puzzle
Thanks! The puzzle is embedded in a computer game, highly unlikely you know it as it's quite obscure.ronald wrote:I put the solution in three parts in case you want to try and figure each part for yourself.
For future reference, the source of the puzzle would be (by far) the best info to give.
azzey  You're lucky, this time.
I'd tried converting to a number system but had forgotten to try other bases. Duh! A very old trick. I should know better. I had used quite a few more complex mathematical systems on the numbers and modelled the values. It's always the simple things you miss.ronald wrote: First, a huge clue:Then, the technique:PRIME_BBCODE_SPOILER_SHOW PRIME_BBCODE_SPOILER:Considering A = 1, B = 2, C= 3 ... helps to solve this
Obviously A = 1, H = 8.
Note, the sequence appears to be counting upward (the letters appear first in order of length, then in alphabetical order).PRIME_BBCODE_SPOILER_SHOW PRIME_BBCODE_SPOILER:Consider counting with the alphabet  but after Z = 26, you have AA = 27, AB = 28, AC = 29,... coincidentally, the same way that Microsoft Excel counts columns.
This is essentially then a 'Base 26' counting system, with 26s and Units  rather than Tens and Units
Thank you again.

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Re: Help with letter puzzle
Yeah, good work Ronald! well done. I also missed the base26 option...
Re: Help with letter puzzle
I'm curious now. I saw a single online reference to the same puzzle being in MUD2, but that doesn't quite match your dates.The puzzle is embedded in a computer game, highly unlikely you know it as it's quite obscure.