The eight corners of the second-order Rubik's cube have 8/24= 1680 positions, and each arrangement has 1 107 color directions, that is, after the second-order Rubik's cube is disrupted, * * has (8! 3^7)/24=7! 3 6 = 3674160 states.
The longest recovery distance of a second-order Rubik's cube is 1 1 full circle, or 14 ordinary circle. This result can be calculated by a computer using an exhaustive algorithm.
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The earliest patent of the second-order Rubik's Cube was applied by Professor rubik Arne on March 29th, 1983/kloc-0. The U.S. patent number is 4378 1 17, which we used to call the second-order Rubik's cube with R structure.
1On October 27th, Li of Taiwan Province Company applied for the second-class patent of another structure, with the U.S. patent number of 582687 1.55438+0. People used to call it the second-order Rubik's Cube with Dong Xian structure. Others have some second-order patents on patterns, such as Mickey head and K ball.
Baidu encyclopedia-second order Rubik's cube