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中心七边形n。  半素数

属于这两组的第一个数字:

22,106,253,386,841,1198,1618,2101,2458,3046,3473,4166,4411,5461,6623,6931,7246,7897,8926,9647,10018,12811,13238,14113,15947,16423,17893,19951,22121,22681,24403,24991,26797,27413,30598,31921,32593,33958,38221,40447,41966,43513,44297,45886,47503,49981,52522,59606,60523,61447,62378,64261,67138,73081,77183,78226,81397,85723,86822,90161,94711,95866,99373,101746,102943,109033,115298,117853,119141,121738,123047,128353,129697,133771,135143,136522,140701,143522,144943,146371,152153,155086,159538,164053,170171,174833,179558,181147,184346,189197,192466,194111,195763,197422,200761,205822,214397,221383,224918,228481,235691,237511,243013,250447,254206,259897,265651,267583,273421,275381,279322,313951,318158,322393,324521,330947,335266,341797,348391,350603,359521,364022,366283,375397,377693,396313,403411,405791,420218,422647,434897,442331,444823,454861,459922,483043,488258,493501,501418,504071,509398,514753,517441,525547,530986,539197,544706,550243,561401,567022,589786,642643,651673,660766,663811,666863,679141,716647,735778,738991,745438,761678,791351,794683,804721,818203,821591,824986,831797,842066,845503,862793,915713,919297,930091,937322,948221,988723,992447,996178,1007413,1045318,1056826,1068397,1076146,1080031,1087822,1095641,1099561,1115311,1119266,1131173,1139146,1151158,1183498,1203938,1208047,1212163,1224553,1228697,1245343,1257901,1274743,1278971,1291697,1304486,1308763,1313047,1343231,1347571,1351918,1360633,1373758,1417963,1435841,1444822,1458346,1471933,1481026,1522291,1526911,1554778,1564123,1620781,1635103,1644686,1654297,1659113,1673603,1678447,1693021,1737121,1776797,1811881,1857493,1867706,1872823,1877947,1919191,1939981,1955647,1960883,1966126,1981897,2008322,2018941,2050966,2088647,2110333,2126671,2170547,2176063,2198197,2214871,2226022,2237201,2254022,2282197,2287853,2299186,2304863,2333353,2350531,2379301,2390858,2402443,2437366,2490223,2513897,2519833,2531726,2537683,2561581,2579578,2591611,2597638,2646106,2658293,2713481,2732003.

一些较大的示例: