质数是逐渐稀疏——记得以前做过一个程序，检查它的概率。。。。。。
但是，具体某个质数的每个字节、或前后字节 是不是会有特别的关系？
——现在主要担心这个问题

以前的计算日志：好像平均每隔21个数里就有一个质数？
2006-08-30 13:05:34.270_1467147499(73170000)d=21.1790(211790/count)delta2=605
2006-08-30 13:05:36.824_1467357377(73180000)d=20.9878(209878/count)delta2=589
2006-08-30 13:05:39.467_1467569611(73190000)d=21.2234(212234/count)delta2=643
2006-08-30 13:05:42.011_1467780943(73200000)d=21.1332(211332/count)delta2=627
2006-08-30 13:05:44.595_1467992101(73210000)d=21.1158(211158/count)delta2=590
2006-08-30 13:05:47.158_1468204217(73220000)d=21.2116(212116/count)delta2=626
2006-08-30 13:05:49.722_1468414067(73230000)d=20.9850(209850/count)delta2=625
2006-08-30 13:05:52.336_1468625069(73240000)d=21.1002(211002/count)delta2=604
2006-08-30 13:05:54.920_1468837613(73250000)d=21.2544(212544/count)delta2=635
。。。。
2006-08-30 13:32:19.388_1596571601(79290000)d=21.3898(213898/count)delta2=602
2006-08-30 13:32:22.042_1596782263(79300000)d=21.0662(210662/count)delta2=638
2006-08-30 13:32:24.796_1596994097(79310000)d=21.1834(211834/count)delta2=626
2006-08-30 13:32:27.450_1597207433(79320000)d=21.3336(213336/count)delta2=635
2006-08-30 13:32:30.113_1597418321(79330000)d=21.0888(210888/count)delta2=602
2006-08-30 13:32:32.777_1597629773(79340000)d=21.1452(211452/count)delta2=634
2006-08-30 13:32:35.441_1597841477(79350000)d=21.1704(211704/count)delta2=600
2006-08-30 13:32:38.145_1598052331(79360000)d=21.0854(210854/count)delta2=643
2006-08-30 13:32:40.829_1598264653(79370000)d=21.2322(212322/count)delta2=583
2006-08-30 13:32:43.503_1598477981(79380000)d=21.3328(213328/count)delta2=636
2006-08-30 13:32:46.166_1598691011(79390000)d=21.3030(213030/count)delta2=619
2006-08-30 13:32:48.880_1598903287(79400000)d=21.2276(212276/count)delta2=624
2006-08-30 13:32:51.524_1599114427(79410000)d=21.1140(211140/count)delta2=633
2006-08-30 13:32:54.188_1599326671(79420000)d=21.2244(212244/count)delta2=601
2006-08-30 13:32:56.852_1599536563(79430000)d=20.9892(209892/count)delta2=666
2006-08-30 13:32:59.526_1599749321(79440000)d=21.2758(212758/count)delta2=623
2006-08-30 13:33:02.230_1599961729(79450000)d=21.2408(212408/count)delta2=608