边长为1的正3边形的面积 = 0.433012702,
边长为1的正4边形的面积 = 1.000000000,
边长为1的正5边形的面积 = 1.720477400,
边长为1的正6边形的面积 = 2.598076212,
边长为1的正7边形的面积 = 3.633912443,
边长为1的正8边形的面积 = 4.828427124,
边长为1的正9边形的面积 = 6.181824193,
四舍五入后得到这样一串数——A134030——2024 年3月11日
{0, 1, 2, 3, 4, 5, 6, 8, 9, 11, 13, 15, 18, 20, 23, 26, 28, 32, 35, 38, 42, 46, 49, 54, 58, 62, 67, 71, 76, 81, 86, 92, 97, 103, 109, 115, 121, 127, 134, 140, 147, 154, 161, 168, 176, 183, 191, 199, 207, 215, 223, 232, 240,
249, 258, 267, 277, 286, 296, 306, 316,326, 336, 346, 357, 368, 379, 390, 401, 412, 424, 436, 447, 459, 472, 484, 496, 509, 522,535, 548, 561, 575, 588, 602, 616, 630, 644, 659, 673, 688, 703, 718, 733, 748, 764,
780, 796, 812, 828, 844, 860, 877, 894, 911, 928, 945, 963, 980, 998, 1016, 1034, 1052, 1071, 1089, 1108, 1127, 1146, 1165, 1184, 1204, 1223, 1243, 1263, 1283, 1304, 1324, 1345, 1365, 1386, 1407, 1429, 1450,
1472, 1493, 1515, 1537, 1559, 1582, 1604, 1627, 1650, 1673, 1696, 1719, 1743, 1766, 1790, 1814, 1838, 1863, 1887, 1912, 1936, 1961, 1986, 2012, 2037, 2062, 2088, 2114, 2140, 2166, 2193, 2219, 2246, 2273,...}
- Table[Round[Cot[Pi/n]*n/4], {n, 3, 99}]
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