How do i make a space between GameObjects in position on x ?

Unity Engine
1 
for (var i = 0; i < SphereCount; i++) {
            var o = GameObject.CreatePrimitive (PrimitiveType.Sphere);
            o.tag = "Sphere";
            o.transform.localScale = new Vector3 (SphereSize, SphereSize, SphereSize);
            o.transform.position = new Vector3 (i + 70, 1, 1);
            GameObject _sphere = GameObject.Find ("Spheres");
            o.transform.parent = _sphere.transform;
        }

The problem is that the first gameobject will be at i + 70 that’s 70
The next one will be at 71 then 72 then 73…But if i want to fhe first onle to be at 70 the next one to be at 75 then 80 then 85 then 90 ?

2 
o.transform.position = new Vector3(i * 5 + 70, 1, 1);