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算术n。  中心七边形n。

属于这两组的第一个数字:

1,22,43,71,197,253,463,547,638,736,953,1198,1331,1471,1772,1933,2101,2276,2647,2843,3046,3473,3697,4166,4411,4663,4922,5461,5741,6028,6623,6931,7246,7897,8233,8926,9283,9647,10396,10781,11173,11572,12391,12811,13238,14113,14561,15478,15947,16423,16906,17396,17893,18397,18908,19426,19951,20483,21022,22121,22681,23822,24403,24991,25586,26797,27413,28666,29303,29947,30598,31921,32593,33272,33958,34651,35351,36772,37493,38221,39698,40447,41203,41966,43513,44297,45886,46691,47503,49148,49981,50821,51668,53383,54251,55126,56897,57793,58696,59606,60523,61447,63316,64261,65213,66172,68111,70078,72073,73081,75118,76147,77183,80333,81397,82468,84631,85723,86822,89041,90161,92422,93563,94711,97028,98197,99373,100556,102943,104147,105358,107801,109033,111518,112771,114031,117853,119141,123047,124363,125686,128353,129697,132406,133771,135143,137908,139301,140701,144943,146371,147806,149248,150697,152153,155086,156563,158047,161036,162541,164053,165572,167098,168631,170171,171718,174833,176401,177976,179558,181147,182743,187573,189197,190828,194111,195763,197422,200761,202441,204128,205822,207523,209231,214397,216133,219626,221383,223147,224918,226696,228481,230273,233878,235691,237511,239338,241172,243013,244861,246716,248578,250447,252323,254206,256096,257993,259897,263726,265651,267583,269522,273421,275381,281303,283291,285286,287288,289297,291313,293336,295366,297403,299447,301498,303556,305621,307693,311858,313951,316051,318158,322393,324521,328798,330947,333103,337436,339613,341797,343988,346186,348391,350603,352822,357281,359521,361768,364022,366283,368551,370826,375397,377693,382306,384623,386947,389278,393961,396313,401038,403411,405791,408178,412973,415381,417796,422647,425083,427526,429976,432433,434897,437368,439846,442331,444823,447322,449828,452341.

一些较大的示例: