A020936 Greatest k such that (k-th prime) < (6 times n-th prime).

5, 7, 10, 13, 18, 21, 26, 30, 33, 40, 42, 47, 53, 55, 60, 66, 71, 72, 79, 82, 84, 91, 94, 99, 106, 110, 113, 116, 119, 123, 135, 137, 142, 145, 154, 154, 160, 165, 168, 174, 180, 180, 189, 191, 194, 196, 205, 217, 218, 220, 221, 227, 228, 239, 242, 248, 255, 257