The Goldbach conjecture asserts that every even integer greater than 2 can be expressed as the sum of two primes.
Given the even integer n, return c, the number of different ways two primes can be added to result in n. Only count a pair once; the order is unimportant.
Example:
Input n = 10 Output c is 2
because of the prime pairs [3 7] and [5 5].
Input n = 50 Output c is 4
because of [3 47], [7 43], [13 37], and [19 31].
675 Solvers
Find perfect placement of non-rotating dominoes (easier)
219 Solvers
Make a run-length companion vector
428 Solvers
245 Solvers
379 Solvers