so i have a list where i need to add new values constantly but when i do i need to increment it and insert it in between two values.

List<int> initializers = new List <int>();

initializers.Add(1);
initializers.Add(3);

so initializers would have 1, 3 values.

i would then process a new set of numbers. the initializers will need to have the values.

1, 5, 3, 7

and if i process another set of numbers it should become

1, 9, 5, 13, 3, 11, 7, 15

i know how to properly generate the new values inserted, i just need some help on inserting it in between the existing values of the initializers without having to add 2 or 3 more loops to move the values' positions.