.
40
40
40 = 2 * 2 * 2 * 5
240 - 1 = 3 * 5 * 5 * 11 * 17 * 31 * 41 * 61681
1040 - 1 = 3 * 3 * 11 * 41 * 73 * 101 * 137 * 271 * 3541 * 9091 * 27961 * 1676321 * 5964848081
40
40 = 2 * 2 * 2 * 5
240 - 1 = 3 * 5 * 5 * 11 * 17 * 31 * 41 * 61681
1040 - 1 = 3 * 3 * 11 * 41 * 73 * 101 * 137 * 271 * 3541 * 9091 * 27961 * 1676321 * 5964848081