23 has been a popular number for a while, in fact, it spawned it's own field of study:Vigintitresology, you can find a lot of information on it
It really entered pop-culture in 1975 with the publication of a book called Illuminatus by Robert Anton Wilson and Robert Shea. In that same book, one of the characters (Simon Moon) discusses the importance of 17 as well, since the product of 2 and 3 is 6, and 23 - 6 is 17.
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