属于这两组的第一个数字：
三,7,131,151,181,313,353,383,797,919,10501,10601,12421,12721,13331,13831,14741,15451,16661,17471,19391,19891,30203,30403,31513,32323,33533,34843,35053,35153,36563,37573,38083,70207,70507,71917,75557,78487,90709,91019,93139,93739,94849,95959,96269,96469,96769,97579,98389,98689,1043401,1062601,1065601,1082801,1160611,1163611,1178711,1180811,1193911,1201021,1212121,1242421,1245421,1250521,1253521,1257521,1276721,1278721,1286821,1287821,1300031,1311131,1317131,1333331,1343431,1362631,1363631,1374731,1407041,1409041,1411141,1422241,1447441,1452541,1456541,1461641,1469641,1489841,1490941,1496941,1508051,1520251,1542451,1550551,1557551,1572751,1580851,1583851,1589851,1597951,1611161,1630361,1658561,1670761,1688861,1703071,1730371,1755571,1764671,1793971,1820281,1831381,1832381,1842481,1883881,1884881,1903091,1908091,1909091,1917191,1924291,1930391,1936391,1952591,1957591,1968691,1970791,1976791,1981891,1982891,1987891,1988891,1995991,1998991,3001003,3002003,3007003,3016103,3026203,3064603,3072703,3073703,3089803,3091903,3095903,3106013,3140413,3158513,3160613,3196913,3212123,3218123,3222223,3223223,3228223,3286823,3291923,3293923,3310133,3315133,3319133,3321233,3329233,3331333,3343433,3353533,3362633,3365633,3411143,3424243,3427243,3439343,3441443,3443443,3449443,3470743,3479743,3485843,3487843,3515153,3517153,3528253,3569653,3589853,3591953,3601063,3618163,3716173,3717173,3728273,3746473,3762673,3763673,3765673,3769673,3774773,3781873,3784873,3793973,3799973,3826283,3858583,3863683,3867683,3871783,3878783,3893983,3899983,3916193,3924293,3938393,3946493,3948493,3970793,7036307,7057507,7065607,7073707,7096907,7115117,7134317,7136317,7145417,7155517,7158517,7177717,7226227,7246427,7250527,7267627,7278727,7310137,7324237,7352537,7354537,7409047,7434347,7436347,7439347,7472747,7493947,7507057,7508057,7521257,7564657,7576757,7594957,7622267,7644467,7662667,7665667,7669667,7693967,7718177,7742477,7747477,7758577,7772777,7791977,7794977,7821287,7832387,7838387,7843487,7943497,7958597,7985897,7996997,9045409,9046409,9067609,9073709,9127219,9128219,9136319,9149419,9179719,9196919,9199919,9200029. 一些较大的示例：
9787879,9795979,9801089,9809089,9817189,9822289,9836389,9888889,9889889,9896989,9907099,9908099,9918199,9931399,9935399,9938399,9957599,9978799,9981899,9989899.