how to find the sum of two numbers that in total will give a prime number( in the list) and print these numbers

Question

For example I have list
Lst = [3, 1, 2, 4, 5]
to find these numbers you need:
1 + 2 = 3 print
3+2=5 print
1+4=5 print
3+4=7 print
5+2=7
So in Output I have to get in
The quantity of these numbers : 5
And and what numbers should be added: it is 3 2, 1 4, 3 4, 5 2