How to generate sequence of numbers in postgresql?

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PostgreSQL

i want to populate one table using sequence of numbers.

What I have tried:

insert into emp
select start_value+1 from city_city_id_seq

if this query executes 10 times it should insert
1,2,3,4,5,6 in a incremental method

here city_city_id_seq is sequence i have created.but it is not giving icremental value or sequence value how to do that please tell me