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Has anyone completed this? No one has yet posted here or in the Other Place. By considering in turn 3dn, 3ac, 9ac, 10ac, and 8dn (with revisiting), I reach a contradiction, namely that 10ac is either 4*9 or 6*9 and a square: there is no such perfect square. I’ve noted that the reference to the Time Travel department may allow the possibility that the puzzle is from the future, but that doesn’t seem to affect my deductions.

Hi carpox1, I have 10a ending in 4 by referring to 22a & the preamble.

I'm making slow progress myself but I think 10a begins with 4, and there is a square that fits 3d.

Thanks to ginge and murky: good to have some food for thought.

There was, of course, a fault in my logic.

Yes, I've finished. I think the preamble should have explicitly said that the term 'factor' includes both 1 and the number itself. E.g. the number of factors of 6 is 4 (1, 2, 3, 6) not 2. I have encountered numericals where the setter meant the latter without saying so.

buzzb,

I thought I was approaching the finish, but have hit an impasse with that blasted snail.

To save my sanity, could you just tell me whether or not 15D is 169?

Thanks.

No.

The building was founded in the 1600's. 1a implies that the note was written after 1900. So 15d is greater than 201.

I'm puzzled by the wording of 15 dn. By my calculations, it is the square OF 1ac, not just a square and a multiple of 1ac. Is that correct?

thanks

Yes, but there's no contradiction there. A^2 is a square and a multiple of A, right?