21, 23, 25, 27, 29
41, 43, 45, 47, 49
61, 63, 65, 67, 69
81, 83, 85, 87, 89
21, 43, 65, 87, 23, 89, и т.д
21, 23, 25, 27, 29
41, 43, 45, 47, 49
61, 63, 65, 67, 69
81, 83, 85, 87, 89
21, 43, 65, 87, 23, 89, и т.д