A366257 Positions of even numbers in May code (A303767).
0, 3, 4, 5, 9, 12, 13, 14, 17, 20, 21, 22, 26, 29, 30, 31, 32, 33, 36, 37, 38, 42, 45, 46, 47, 50, 53, 54, 55, 59, 62, 63, 64, 65, 68, 69, 70, 74, 77, 78, 79, 82, 85, 86, 87, 91, 94, 95, 96, 97, 98, 101, 102, 103, 107, 110, 111, 112, 115, 118, 119, 120, 124, 127, 128, 129, 132, 133, 134, 138, 141, 142, 143, 146, 149
Offset: 1