SQL Query to return N rows from dual

Question

I want to write a SQL query which accepts a bind variable (say :NUM) and its output consists of one column & :NUM number of rows, each row having its row number. i.e. if we

Answer 1

Query without connect by

WITH num(n) as(select 1 from dual union all
select n+1 from num where n <= :num_limit)
select * from num