36N(N+1)加減1是孿生素數,其中的N叫苗寶數,苗寶數有很多,在1億以內有109128個它們是
1,3,8,13,14,19,21,24,29,34,43,55,66,89,101,105,
118,119,141,164,185,199,204,208,218,223,230,253,264,266,
283,294,300,320,328,393,406,413,425,430,440,446,456,474,
489,490,505,521,526,530,549,568,574,600,609,614,619,621,
654,659,680,693,740,745,756,773,784,815,825,846,854,855,
871,880,881,895,910,936,10034, 10039, 10086, 10118, 10153, 10156,
10178, 10235, 10248, 10254, 10283, 10354, 10384, 10415, 10466,10479,10566,
10676, 10683, 10776, 10806, 10844, 10848, 10870, 10923, 10946, 10984, 10993,
10995, 11051, 11066, 11108, 11130, 11203, 11236, 11271, 11299, 11324, 11346,
11350, 11355, 11378, 11404, 11466, 11469, 11501, 11518, 11579, 11598, 11618,
11646, 11700, 11768, 11786, 11788, 11789, 11810, 11871, 11884, 11936, 11996,
12074, 12075, 12181, 12274, 12354, 12398, 12465, 12475, 12480, 12528, 12584,
12634, 12666, 12750, 12785, 12818, 12830, 12906, 12978, 12990, 12999, 13014,
13019, 13051, 13121, 13153, 13186, 13243, 13261, 13264, 13335, 13459, 13480,
13509, 13574, 13608, 13620, 13739, 13819, 13838, 13893, 13910, 13965, 13998,
13999, 14043, 14064, 14080, 14148, 14161, 14189, 14194, 14215, 14245, 14330,
14393, 14468, 14486, 14516, 14535, 14560, 14563, 14568, 14581, 14584, 14600,
14640, 14666, 14680, 14700, 14720, 14726, 14743, 14756, 14759, 14761, 14764,
14804, 14843, 14850, 14906, 14924, 14943, 14946, 14960, 14986, 14988, 15016,
15084, 15193, 15245, 15246, 15333, 15338, 15364, 15420, 15483, 15498, 15505,
15506, 15524, 15539, 15574, 15625, 15653, 15665, 15673, 15700, 15704, 15729,
15736, 15741, 15758, 15855, 15870, 15928, 15963, 15966, 15991, 15996, 16015,
16035, 16108, 16133, 16168, 16171, 16183, 16199, 16234, 16271, 16443, 16451,
16590, 16656, 16665, 16694, 16733, 16735, 16796, 16873, 16875, 16911, 16974,
16988, 17039, 17123, 17199, 17220, 17246, 17338, 17340, 17358, 17365, 17381,
17403, 17409, 17463, 17473, 17506, 17515, 17604, 17625, 17695, 17746, 17766,
17785, 17864, 17905, 17935, 17940, 18024, 18061, 18126, 18185, 18263, 18299,
18305, 18343, 18360, 18445, 18469, 18494, 18593, 18609, 18648, 18656, 18665,
18691, 18784, 18800, 18810, 18849, 18875, 18940, 18983, 19034, 19069, 19111,
19125, 19379, 19409, 19418, 19428, 19430, 19514, 19608, 19614, 19795, 19941,
19948, 19991, 20013, 20044, 20065, 20114, 20229, 20256, 20278, 20296, 20373,
苗寶數可用無限多的素數來篩選,除以5餘2的,除以7餘2和4的,除以13餘5和7的,除以17餘6和10的,除以23餘5和17的,除以31餘2和28的,還有餘7和23的,除以37餘10和26的,除以41餘9和31的,還有餘12和28的,除以43餘2和40的,除以47餘5和41的,除以53餘15和37的,除以67餘31和35的,除以71餘1和69的,除以73餘1和71的,除以83餘5和77的,除以89餘6和82的,除以97餘11和85的,除以103餘4和98的,除以107餘10和96的,除以113餘39和73的,除以127餘26和100的,除以137餘12 和124的,除151餘40和110的,除以157餘75和81的,除以163餘15和147的,除167餘23和143的,除以193餘49和143的,除以197餘53和143的,除以191餘76和114的,除以199餘26和172的,等等,這些數都不是苗寶數。還有無限多的素數可以用來篩選;但也有無限多素數不能當篩子篩選,如:2,3,11,19,29,59,61,101,109,131,139,149,179,181,等等。
苗寶數在100000000內有109128個,苗寶數已證明無限多的,等待權威的認可。