SQL & PL/SQL

Hi all ,
I am tryting to write a function which will have print ( Number 0r Character)
as


1
2 2
3 3 3
4 4 4 4
5 5 5 5 5

in this sequence
then

aaa
bbb bbb
ccc ccc ccc
dddd dddd dddd dddd
ggggg ggggg ggggg ggggg ggggg

I tried this but know i am just a Beginner here

CREATE OR REPLACE FUNCTION test_numberarray
(numberarr in number ) RETURN NUMBER is
val number := 0 ;
val1 NUMBER := 0;

BEGIN
for i in 1 .. numberarr loop
val1 := i + val1;
val := Val1;
dbms_output.put_line('The number array is :- '|| val1 ||' '|| val);
END loop;

Return val1;

End;

Can any body pls point me out how should i correct it.
What should i take care henceforth tno to make any such mistakes like this.

Thanks in advance