A057458 Number of k, 1 <= k <= n, where {k (n+1-k) + 1} is prime.

1, 2, 1, 4, 0, 6, 3, 2, 2, 8, 1, 12, 2, 2, 4, 16, 2, 10, 5, 2, 8, 14, 2, 14, 2, 8, 9, 16, 0, 20, 11, 4, 4, 14, 2, 18, 16, 8, 7, 28, 2, 32, 6, 6, 10, 24, 5, 14, 14, 8, 21, 42, 0, 22, 8, 14, 12, 22, 4, 24, 18, 14, 20, 14, 2, 44, 14, 14, 10, 34, 5, 46, 20, 4, 18, 38, 4, 38, 15, 10, 16, 46, 2