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中心三角形n。  双素数

属于这两组的第一个数字:

19,31,109,199,571,829,1489,1999,2341,2971,3529,4789,9721,10459,10711,13681,16069,17659,20359,27541,31321,48871,51061,57331,72271,89671,104149,110569,142759,145549,154081,164839,182179,193861,211501,244219,260209,295039,322249,340579,352111,380269,398611,451279,464539,510709,570109,577531,598189,613441,660349,770059,865261,1019701,1037089,1079929,1216351,1246249,1335289,1427401,1442071,1501501,1513531,1525609,1562131,1633339,1699741,1910269,2072701,2086831,2129509,2143831,2201599,2245429,2413639,2455681,2471059,2501959,2627479,2659339,2695411,2756071,2921131,2988499,3199591,3287821,3486151,3559711,3742231,3953629,3992689,4150849,4155841,4419559,4481569,4523149,5081161,5125429,5253769,5549779,5665789,6021019,6069199,6099409,6123631,6190489,6269971,6719359,6744781,6846949,6872611,7027591,7099201,7158061,7289731,7336099,7496191,7523041,7766851,8386291,8607631,9110641,9162469,9251659,9499159,10418791,10426699,11290189,11331379,12068599,13351909,13940029,14040811,14151169,14224981,14308249,14973661,15712399,15751261,15858379,16142521,16330051,17345101,17539471,18380251,18464359,18622579,18919729,19391431,19434601,20098891,20219869,20529451,20573869,21302389,21426931,21894331,22343611,22855969,23102551,24138199,24963481,25110559,25159681,25258069,25467781,25566769,25665949,25752889,25952161,26516731,26820319,27074629,27728551,28520941,28835761,29046601,29244961,29364301,29617039,29777221,30381751,30422269,30598159,32566411,32580391,32692339,33765421,34150819,34222429,35422111,36894961,38049499,38170471,38580169,38885059,39252511,40318561,41999959,42190669,42381811,43086361,43812931,44316991,44905969,45515359,45697321,46445491,47773639,48402121,48743551,49844191,50608009,51588541,51941011,53721361,53991001,54441901,54640891,55659559,55879069,56264251,57279331,57725119,58490671,59449981,60683941,61276909,62917579,63834079,64167211,66523411,67264669,67727521,69840229,70188661,70414579,70929379,71094511,71756959,71902279,72986401,75710881,76458691,77081089,79137649,79159441,83019241,83399089,87451291,87657571,88577311,89015869,89293411,90128629,93035251,94101481,95245489,96372361,96468571,96877999,97360789,97457491,99181939,103621549,103821121,103920979,104245849,105324031,105424609,105625909,106054309,107573239,108158359,109282141,109307749,110514709,113026621,117099091,119336221.

一些较大的示例: