## Sum of four primes

Published:

First read the problem description.

The Goldbach’s
conjecture has been proved up to \(4*10^{18}\), which is enough for our
problem. We set `p1 = 2`

and `p2 = 2`

if
`n`

is even or `p2 = 3`

if `n`

is odd.
So that the sum of `p3 >= 3`

and `p4 >= 3`

needs to be even.

Source code of the solution(s):