how to get the division number

i want to get the first element to divide on 3

for example

3 is the first element

6 is the second element

9 is the third element

or any number not only 3

[Rik]

Sounds like homework. What have you tried so far? What issue did you encounter?

Answer 1

[KSSV]

Read about linspace, mod. It is a basic mathematics that if mod(x,n) = 0, then x is divisible by n.

n = 7 ;
x = 1:15 ; 
x(mod(x,n)==0)