Simple way to get missing number - Mailing list pgsql-sql

Good morning,

May I know is there a simple sql command which could return missing
numbers please?

For example,

t1(id integer)

values= 1, 2, 3 .... 5000000

select miss_num(id)
from   t1 ;


Will return:
===============
37, 800, 8001

Thanks a lot!
Emi