As a side note to this:
Urban Dictionary
23 and 1: serving a prison sentence , being locked in a cell for 23 hours a day leaving you with 1 hour usualy given to those who commit serious crimes like 1st degree murder
Ho hum. Maybe that influenced the choice to be 23 hour party people *pokes Feel Good Inc.*
Or maybe I'm reading too much into it.
I know which is more likely! XP
EDIT: Also -
Urban Dictionary
23 Skidoo:1. A nonsense phrase used in the 20s. See 28 Skidoo. Usually a positive thing.
"23 Skiddoo!" said the flapper as she checked out the guy in the zoot suit.2. A term used in the early 20th Century for "get lost."
Bums would sleep around 23rd St and when the cops came along they would hit them with their billy clubs and say "23 skidoo."
My grandfather was a cop down there around 1920 and told me how this term came about.
Hey buddy, 23 skidoo. 
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