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本帖最后由 愚工688 于 2022-7-31 05:03 编辑
我曾经用连乘式计算了10万内的素数数量,如下:
in [2, 1000 ]: S= 168 r= 31 k= 11 p(b)= .153 Sp= 163.7 Δ=-.026
in [2, 2000 ]: S= 303 r= 43 k= 14 p(b)= .142 Sp= 297.3 Δ=-.019
in [2, 3000 ]: S= 430 r= 53 k= 16 p(b)= .136 Sp= 424.13 Δ=-.014
in [2, 4000 ]: S= 550 r= 61 k= 18 p(b)= .132 Sp= 544.22 Δ=-.011
in [2, 5000 ]: S= 669 r= 67 k= 19 p(b)= .13 Sp= 666.99 Δ=-.003
in [2, 6000 ]: S= 783 r= 73 k= 21 p(b)= .126 Sp= 777.16 Δ=-.007
in [2, 7000 ]: S= 900 r= 83 k= 23 p(b)= .123 Sp= 883.54 Δ=-.018
in [2, 8000 ]: S= 1007 r= 89 k= 24 p(b)= .122 Sp= 996.44 Δ=-.01
in [2, 9000 ]: S= 1117 r= 89 k= 24 p(b)= .122 Sp= 1118.01 Δ= .001
in [2, 10000 ]: S= 1229 r= 97 k= 25 p(b)= .12 Sp= 1228.05 Δ=-.001
in [2, 11000 ]: S= 1335 r= 103 k= 27 p(b)= .118 Sp= 1324.55 Δ=-.008
in [2, 12000 ]: S= 1438 r= 109 k= 29 p(b)= .116 Sp= 1418.42 Δ=-.014
in [2, 13000 ]: S= 1547 r= 113 k= 30 p(b)= .115 Sp= 1521.9 Δ=-.016
in [2, 14000 ]: S= 1652 r= 113 k= 30 p(b)= .115 Sp= 1636.67 Δ=-.009
in [2, 15000 ]: S= 1754 r= 113 k= 30 p(b)= .115 Sp= 1751.44 Δ=-.001
in [2, 16000 ]: S= 1862 r= 113 k= 30 p(b)= .115 Sp= 1866.21 Δ= .002
in [2, 17000 ]: S= 1960 r= 127 k= 31 p(b)= .114 Sp= 1966.61 Δ= .003
in [2, 18000 ]: S= 2064 r= 131 k= 32 p(b)= .113 Sp= 2065.84 Δ= .001
in [2, 19000 ]: S= 2158 r= 137 k= 33 p(b)= .112 Sp= 2164.16 Δ= .003
in [2, 20000 ]: S= 2262 r= 139 k= 34 p(b)= .111 Sp= 2261.2 Δ= 0
in [2, 21000 ]: S= 2360 r= 139 k= 34 p(b)= .111 Sp= 2372.56 Δ= .005
in [2, 22000 ]: S= 2464 r= 139 k= 34 p(b)= .111 Sp= 2483.93 Δ= .008
in [2, 23000 ]: S= 2564 r= 151 k= 36 p(b)= .11 Sp= 2563.25 Δ= 0
in [2, 24000 ]: S= 2668 r= 151 k= 36 p(b)= .11 Sp= 2673.14 Δ= .002
in [2, 25000 ]: S= 2762 r= 157 k= 37 p(b)= .109 Sp= 2766.53 Δ= .002
in [2, 26000 ]: S= 2860 r= 157 k= 37 p(b)= .109 Sp= 2875.71 Δ= .005
in [2, 27000 ]: S= 2961 r= 163 k= 38 p(b)= .109 Sp= 2967.81 Δ= .002
in [2, 28000 ]: S= 3055 r= 167 k= 39 p(b)= .108 Sp= 3059.13 Δ= .001
in [2, 29000 ]: S= 3153 r= 167 k= 39 p(b)= .108 Sp= 3167 Δ= .004
in [2, 30000 ]: S= 3245 r= 173 k= 40 p(b)= .107 Sp= 3257.16 Δ= .004
in [2, 31000 ]: S= 3340 r= 173 k= 40 p(b)= .107 Sp= 3364.4 Δ= .007
in [2, 32000 ]: S= 3432 r= 173 k= 40 p(b)= .107 Sp= 3471.65 Δ= .012
in [2, 33000 ]: S= 3538 r= 181 k= 42 p(b)= .106 Sp= 3541.68 Δ= .001
in [2, 34000 ]: S= 3638 r= 181 k= 42 p(b)= .106 Sp= 3647.73 Δ= .003
in [2, 35000 ]: S= 3732 r= 181 k= 42 p(b)= .106 Sp= 3753.78 Δ= .006
in [2, 36000 ]: S= 3824 r= 181 k= 42 p(b)= .106 Sp= 3859.84 Δ= .009
in [2, 37000 ]: S= 3923 r= 191 k= 43 p(b)= .105 Sp= 3946.35 Δ= .006
in [2, 38000 ]: S= 4017 r= 193 k= 44 p(b)= .105 Sp= 4032.07 Δ= .004
in [2, 39000 ]: S= 4107 r= 197 k= 45 p(b)= .104 Sp= 4117.25 Δ= .002
in [2, 40000 ]: S= 4203 r= 199 k= 46 p(b)= .104 Sp= 4201.68 Δ= 0
in [2, 41000 ]: S= 4291 r= 199 k= 46 p(b)= .104 Sp= 4305.58 Δ= .003
in [2, 42000 ]: S= 4392 r= 199 k= 46 p(b)= .104 Sp= 4409.47 Δ= .004
in [2, 43000 ]: S= 4494 r= 199 k= 46 p(b)= .104 Sp= 4513.37 Δ= .004
in [2, 44000 ]: S= 4579 r= 199 k= 46 p(b)= .104 Sp= 4617.26 Δ= .008
in [2, 45000 ]: S= 4675 r= 211 k= 47 p(b)= .103 Sp= 4700 Δ= .005
in [2, 46000 ]: S= 4761 r= 211 k= 47 p(b)= .103 Sp= 4803.4 Δ= .009
in [2, 47000 ]: S= 4851 r= 211 k= 47 p(b)= .103 Sp= 4906.8 Δ= .012
in [2, 48000 ]: S= 4946 r= 211 k= 47 p(b)= .103 Sp= 5010.2 Δ= .013
in [2, 49000 ]: S= 5035 r= 211 k= 47 p(b)= .103 Sp= 5113.61 Δ= .016
in [2, 50000 ]: S= 5133 r= 223 k= 48 p(b)= .103 Sp= 5194.82 Δ= .012
in [2, 51000 ]: S= 5222 r= 223 k= 48 p(b)= .103 Sp= 5297.76 Δ= .015
in [2, 52000 ]: S= 5319 r= 227 k= 49 p(b)= .102 Sp= 5378.12 Δ= .011
in [2, 53000 ]: S= 5408 r= 229 k= 50 p(b)= .102 Sp= 5457.89 Δ= .009
in [2, 54000 ]: S= 5500 r= 229 k= 50 p(b)= .102 Sp= 5559.93 Δ= .011
in [2, 55000 ]: S= 5590 r= 233 k= 51 p(b)= .102 Sp= 5638.88 Δ= .009
in [2, 56000 ]: S= 5683 r= 233 k= 51 p(b)= .102 Sp= 5740.48 Δ= .01
in [2, 57000 ]: S= 5782 r= 233 k= 51 p(b)= .102 Sp= 5842.08 Δ= .01
in [2, 58000 ]: S= 5873 r= 239 k= 52 p(b)= .101 Sp= 5920.02 Δ= .008
in [2, 59000 ]: S= 5963 r= 241 k= 53 p(b)= .101 Sp= 5997.43 Δ= .006
in [2, 60000 ]: S= 6057 r= 241 k= 53 p(b)= .101 Sp= 6098.18 Δ= .007
in [2, 61000 ]: S= 6145 r= 241 k= 53 p(b)= .101 Sp= 6198.94 Δ= .009
in [2, 62000 ]: S= 6232 r= 241 k= 53 p(b)= .101 Sp= 6299.69 Δ= .011
in [2, 63000 ]: S= 6320 r= 241 k= 53 p(b)= .101 Sp= 6400.45 Δ= .013
in [2, 64000 ]: S= 6413 r= 251 k= 54 p(b)= .1 Sp= 6476.51 Δ= .01
in [2, 65000 ]: S= 6493 r= 251 k= 54 p(b)= .1 Sp= 6576.86 Δ= .013
in [2, 66000 ]: S= 6591 r= 251 k= 54 p(b)= .1 Sp= 6677.22 Δ= .013
in [2, 67000 ]: S= 6675 r= 257 k= 55 p(b)= .1 Sp= 6752.41 Δ= .012
in [2, 68000 ]: S= 6774 r= 257 k= 55 p(b)= .1 Sp= 6852.37 Δ= .012
in [2, 69000 ]: S= 6854 r= 257 k= 55 p(b)= .1 Sp= 6952.33 Δ= .014
in [2, 70000 ]: S= 6935 r= 263 k= 56 p(b)= .1 Sp= 7026.69 Δ= .013
in [2, 71000 ]: S= 7033 r= 263 k= 56 p(b)= .1 Sp= 7126.27 Δ= .013
in [2, 72000 ]: S= 7128 r= 263 k= 56 p(b)= .1 Sp= 7225.86 Δ= .014
in [2, 73000 ]: S= 7218 r= 269 k= 57 p(b)= .099 Sp= 7299.42 Δ= .011
in [2, 74000 ]: S= 7301 r= 271 k= 58 p(b)= .099 Sp= 7372.54 Δ= .01
in [2, 75000 ]: S= 7393 r= 271 k= 58 p(b)= .099 Sp= 7471.38 Δ= .011
in [2, 76000 ]: S= 7484 r= 271 k= 58 p(b)= .099 Sp= 7570.23 Δ= .012
in [2, 77000 ]: S= 7567 r= 277 k= 59 p(b)= .098 Sp= 7642.6 Δ= .01
in [2, 78000 ]: S= 7662 r= 277 k= 59 p(b)= .098 Sp= 7741.09 Δ= .01
in [2, 79000 ]: S= 7746 r= 281 k= 60 p(b)= .098 Sp= 7812.89 Δ= .009
in [2, 80000 ]: S= 7837 r= 281 k= 60 p(b)= .098 Sp= 7911.03 Δ= .009
in [2, 81000 ]: S= 7925 r= 283 k= 61 p(b)= .098 Sp= 7982.08 Δ= .007
in [2, 82000 ]: S= 8017 r= 283 k= 61 p(b)= .098 Sp= 8079.87 Δ= .008
in [2, 83000 ]: S= 8106 r= 283 k= 61 p(b)= .098 Sp= 8177.66 Δ= .009
in [2, 84000 ]: S= 8190 r= 283 k= 61 p(b)= .098 Sp= 8275.46 Δ= .01
in [2, 85000 ]: S= 8277 r= 283 k= 61 p(b)= .098 Sp= 8373.25 Δ= .012
in [2, 86000 ]: S= 8362 r= 293 k= 62 p(b)= .097 Sp= 8443.34 Δ= .01
in [2, 87000 ]: S= 8450 r= 293 k= 62 p(b)= .097 Sp= 8540.8 Δ= .011
in [2, 88000 ]: S= 8543 r= 293 k= 62 p(b)= .097 Sp= 8638.25 Δ= .011
in [2, 89000 ]: S= 8619 r= 293 k= 62 p(b)= .097 Sp= 8735.71 Δ= .014
in [2, 90000 ]: S= 8713 r= 293 k= 62 p(b)= .097 Sp= 8833.17 Δ= .014
in [2, 91000 ]: S= 8802 r= 293 k= 62 p(b)= .097 Sp= 8930.63 Δ= .015
in [2, 92000 ]: S= 8887 r= 293 k= 62 p(b)= .097 Sp= 9028.09 Δ= .016
in [2, 93000 ]: S= 8984 r= 293 k= 62 p(b)= .097 Sp= 9125.55 Δ= .016
in [2, 94000 ]: S= 9070 r= 293 k= 62 p(b)= .097 Sp= 9223.01 Δ= .017
in [2, 95000 ]: S= 9157 r= 307 k= 63 p(b)= .097 Sp= 9291.31 Δ= .015
in [2, 96000 ]: S= 9252 r= 307 k= 63 p(b)= .097 Sp= 9388.45 Δ= .015
in [2, 97000 ]: S= 9336 r= 311 k= 64 p(b)= .097 Sp= 9456.29 Δ= .013
in [2, 98000 ]: S= 9418 r= 313 k= 65 p(b)= .097 Sp= 9523.8 Δ= .011
in [2, 99000 ]: S= 9505 r= 313 k= 65 p(b)= .097 Sp= 9620.32 Δ= .012
in [2, 100000 ]: S= 9592 r= 313 k= 65 p(b)= .097 Sp= 9716.84 Δ= .013
求X内的素数数量,我的Basic 程序太低级了,不能计算大的范围。我曾经试验过,计算到3千万用了近3天。
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