显示找到的3个结果中的1-3个。
第页1
a(n)=数字和为n的2位数素数,其中n在[2..17]范围内穿过3的非倍数。
+10 4
1, 2, 2, 2, 3, 3, 3, 1, 1, 2, 1
例子
两位数素数的数字和
总和计数
2 1
4 2
5 2
7 2
8 3
10 3
11 3
13 1
14 1
16 2
17 1
a(n)=数字和为n的9位数素数,其中n在[2..80]范围内穿过3的非倍数。
+10 4
0, 2, 26, 226, 372, 1457, 3312, 9159, 13320, 32077, 50752, 102027, 138554, 249053, 331920, 535444, 655423, 966278, 1152057, 1546854, 1751100, 2168566, 2374001, 2719026, 2850784, 3029814, 3063907, 3019100, 2943918, 2691740, 2519884, 2134422, 1930862, 1511648, 1303187, 935353, 783315, 514221, 402227, 238252, 182466, 97415, 66012, 30140, 21162, 8438, 4350, 1311, 906, 170, 65, 3, 1
例子
9位素数的数字和
总和计数
2 0
4 2
5 26
7 226
8 372
10 1457
11 3312
13 9159
14 13320
16 32077
17 50752
19 102027
20 138554
22 249053
23 331920
25 535444
26 655423
28 966278
29 1152057
31 1546854
32 1751100
34 2168566
...
按行读取的不规则数组。第r行的第k项是具有数字和k的r位素数的个数。
+10 三
1, 0, 1, 1, 0, 1, 2, 2, 2, 3, 3, 3, 1, 1, 2, 1, 1, 2, 4, 7, 7, 12, 13, 16, 16, 13, 18, 12, 11, 6, 4, 1, 0, 0, 4, 8, 20, 19, 31, 52, 67, 77, 93, 101, 116, 95, 92, 91, 63, 51, 29, 30, 16, 5, 0, 1, 0, 4, 12, 28, 45, 95, 143, 236, 272, 411, 479, 630, 664, 742, 757, 741, 706, 580, 528, 379, 341, 205, 166, 84, 62, 34, 13, 4, 2, 0, 2, 14, 58, 76, 204, 389, 660, 852, 1448, 1971, 2832, 3101, 4064, 4651, 5393, 5376, 5570, 5785, 5287, 4796
评论
每行r都有6r-1个术语。第一行不考虑素数3及其计数1。
例子
从第二行开始,只有11个数字是sum 2,所以第一个术语是1;13和31都有数字sum 4,所以第二项是2;23和41都有数字和5,所以第三项是2;等。
第三行开始时,只有101->2,所以第一项是1,103和211->4,所以第二项是2;113、131、311和401->5,因此其第三项为4;等。
\k.2,。。4,..5,...7,...8,...10,...11,....13,....14,....16,.....17,.....19,.....20,.....22,......23,......25,......26,...,
第页\
.1: 1,..0,..1,...1,...0}
.2: 1,..2,..2,...2,...三,。。。。三,。。。。三,。。。。。1,.....1,.....2,......1}
.3: 1,..2,..4,...7,...7,...12,...13,....16,....16,....13,.....18,.....12,.....11,......6,.......4,.......1,.......0}
.4: 0,..4,..8,..20,..19,...31,...52,....67,....77,....93,....101,....116,.....95,.....92,......91,......63,......51, ...,
.5: 0,..4,.12,..28,..45,...95,..143,...236,...272,...411,....479,....630,....664,....742,.....757,.....741,.....706, ...,
.6: 0,..2,.14,..58,..76,..204,..389,...660,...852,..1448,...1971,...2832,...3101,...4064,....4651,....5393,....5376, ...,
.7: 0,..5,.21,..95,.138,..420,..773,..1747,..2329,..4616,...6456,..10496,..12743,..18710,...22447,...29209,...32075, ...,
.8: 0,..4,.24,.154,.212,..787,.1705,..4214,..5721,.12546,..19040,..34639,..43707,..71879,...92223,..135728,..155461, ...,
.9: 0,..2,.26,.226,.372,.1457,.3312,..9159,.13320,.32077,..50752,.102027,.138554,.249053,..331920,..535444,..655423, ...,
10: 0,.11,.42,.278,.547,.2395,.6090,.19204,.27894,.75517,.128909,.284482,.391199,.772365,.1087932,.1919618,.2427462, ...,
等。
数学
dir[n_]:=楼层[(3 n+2)/2];inv[n_]:=楼层[(2 n-1)/3];f[n_]:=块[{p=NextPrime[10^(n-1)],t=表[0,{inv[9n]}]},而[p<10^n,t[[inv[Plus@@IntegerDigits@p]]++;p=NextPrime@p];t] ;数组[f,5]//展平
交叉参考
囊性纤维变性。A000040型,A006880型,A007605号,A177868号,A178183号,A178447号,A178571号,A178605型,A178876号,A178879号,A178884号.
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