@TVF Answer to the Ultimate Question of Life, the Universe, and Everything?
Hitchhiker's guide references aside, the OP does ask a seeming simple/innocent question.
Why 45? Why not 44? or 46?
I know I will date myself with this but I digress......
I used to play this game on BBS systems (think dial-up modem) back in the early 90s (before the days of the modern internet) called Trade Wars 2002. You buy ships and they each had a max cargo capacity. Some had 50, others 100, others had 250 etc.....one messed up ship, the StarMastem, had 73. Everyone back then was like, Whiskey Tango Foxtrot, why 73? Why not 75? Why not 70?
Maybe the OP is just trying to figure out his own version of this.