take bus number 123/ take THE bus number 123 ??

what would you say?

or maybe sth else on the subject
pls, go to gate 5/ go to THE gate 5 ??

take bus no 123
take the bus...
please go to gate number 5
please go to the gate...

jeszcze;
take the/a 123

tak,

so, is there a difference between

take bus number 123 and take the bus number 123 ?

sorry, I probably didn't get your point

we rather don't say "take the bus number xxxxx"?
do I get it?