It's the answer to life, the universe and everything, according to Douglas Adams (5-3)

I believe the answer is:

forty-two

(Other definitions for forty-two that I've seen before include "The answer to the Ultimate Question of Life, the Universe, and Everything (Hitchhikers Guide to the Galaxy)" , "Three fourteens" , "Douglas Adams' numerical Answer to Life, The Universe and Everything" .)

I've seen this clue in The Irish Times.

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