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中心三角形n。  半素数

属于这两组的第一个数字:

4,10,46,85,166,235,274,361,514,694,901,1135,1219,1306,1585,1891,2461,2839,3106,3385,3826,3979,4135,5311,5674,6049,6241,6835,7246,8551,9481,10966,11485,11749,12286,12559,13969,15151,15454,17335,18649,18985,19666,21421,21781,22879,23626,24385,26734,27949,28774,30034,32194,33079,33526,34885,35806,38161,38641,41086,43606,46201,46729,48331,50509,55585,57919,59701,60301,64585,65209,67099,77635,79006,80389,81085,82486,83191,83899,86041,86761,92629,94879,96394,97921,101011,101791,102574,104941,106534,107335,111385,113851,118021,120559,121411,124849,127459,128335,131869,134551,135451,138169,139081,140914,143686,146485,149311,153121,166834,168841,169849,172891,173911,185329,186385,188506,189571,194941,198199,200386,203689,205906,207019,208135,216031,217171,221761,226399,227566,229909,235819,239401,240601,245431,246646,250309,255235,256474,258961,262714,270301,279289,284491,285799,291061,296371,297706,300385,301729,304426,305779,308494,311221,315334,319474,333469,334885,337726,344881,350659,362359,363835,365314,368281,369769,372754,374251,381781,384814,386335,387859,393985,397066,400159,404821,414226,417385,418969,422146,423739,426934,430141,439834,444721,452926,457885,479686,484789,489919,491635,496801,498529,503731,505471,507214,515974,524809,531931,546319,549946,555409,564574,575671,590635,592519,600085,603886,605791,607699,615361,628885,630829,634726,636679,638635,646489,650434,654391,662341,670339,676369,694621,702811,715186,725581,733951,738154,744481,755086,759349,761485,765766,767911,785179,787351,793885,796069,802639,804835,813649,822511,829189,831421,835894,838135,840379,842626,856171,858439,874399,878986,892819,897454,904429,909094,911431,916114,920809,923161,932599,942085,949231,951619,958801,970831,987799,990235,997561,1000009,1009831,1012294,1027135,1029619,1032106,1047091,1057141,1069771,1087579,1097821.

一些较大的示例: