由已知知:4-c^2+2a=c,a=(c^2+c-4)/2,
给定一系列素数c,可得一个a,看一看a是素数吗;啊,素数a可不止太阳先生的3个呀!怎么连最小的a=13,c=5也丢了呢?
(万内素数c中有191个素数a)
素数号 c a a素性
3 5 13 prime
6 13 89 prime
7 17 151 prime
10 29 433 prime
12 37 701 prime
13 41 859 prime
16 53 1429 prime
18 61 1889 prime
21 73 2699 prime
24 89 4003 prime
25 97 4751 prime
35 149 11173 prime
37 157 12401 prime
44 193 18719 prime
45 197 19501 prime
51 233 27259 prime
55 257 33151 prime
57 269 36313 prime
59 277 38501 prime
60 281 39619 prime
65 313 49139 prime
68 337 56951 prime
77 389 75853 prime
79 401 80599 prime
80 409 83843 prime
88 457 104651 prime
97 509 129793 prime
98 521 135979 prime
100 541 146609 prime
112 613 188189 prime
116 641 205759 prime
122 673 226799 prime
126 701 246049 prime
139 797 318001 prime
148 857 367651 prime
151 877 385001 prime
152 881 388519 prime
158 929 431983 prime
162 953 454579 prime
168 997 497501 prime
169 1009 509543 prime
174 1033 534059 prime
183 1093 597869 prime
186 1109 615493 prime
187 1117 624401 prime
189 1129 637883 prime
191 1153 665279 prime
196 1193 712219 prime
211 1297 841751 prime
212 1301 846949 prime
220 1373 943249 prime
221 1381 954269 prime
227 1433 1027459 prime
234 1481 1097419 prime
238 1493 1115269 prime
245 1553 1206679 prime
251 1597 1276001 prime
252 1601 1282399 prime
254 1609 1295243 prime
259 1637 1340701 prime
267 1709 1461193 prime
275 1777 1579751 prime
290 1889 1785103 prime
293 1913 1830739 prime
295 1933 1869209 prime
296 1949 1900273 prime
306 2017 2035151 prime
310 2053 2108429 prime
312 2069 2141413 prime
313 2081 2166319 prime
320 2129 2267383 prime
326 2161 2336039 prime
330 2213 2449789 prime
332 2237 2503201 prime
342 2297 2639251 prime
347 2341 2741309 prime
350 2357 2778901 prime
356 2393 2864419 prime
361 2437 2970701 prime
378 2593 3363119 prime
380 2617 3425651 prime
381 2621 3436129 prime
391 2689 3616703 prime
392 2693 3627469 prime
400 2741 3757909 prime
401 2749 3779873 prime
408 2801 3924199 prime
415 2857 4082651 prime
421 2909 4232593 prime
425 2953 4361579 prime
438 3061 4686389 prime
442 3089 4772503 prime
454 3209 5150443 prime
466 3313 5489639 prime
469 3329 5542783 prime
476 3373 5690249 prime
477 3389 5744353 prime
487 3469 6018713 prime
493 3529 6228683 prime
494 3533 6242809 prime
498 3557 6327901 prime
501 3581 6413569 prime
514 3677 6762001 prime
518 3709 6880193 prime
525 3769 7104563 prime
530 3821 7301929 prime
542 3917 7673401 prime
554 4013 8054089 prime
560 4057 8231651 prime
561 4073 8296699 prime
564 4093 8378369 prime
585 4261 9080189 prime
587 4273 9131399 prime
592 4337 9406951 prime
599 4397 9669001 prime
601 4421 9774829 prime
606 4457 9934651 prime
617 4549 10348973 prime
618 4561 10403639 prime
622 4597 10568501 prime
625 4637 10753201 prime
636 4721 11146279 prime
638 4729 11184083 prime
647 4801 11527199 prime
651 4861 11817089 prime
663 4957 12288401 prime
665 4969 12347963 prime
668 4993 12467519 prime
679 5081 12910819 prime
684 5113 13073939 prime
701 5281 13947119 prime
706 5333 14223109 prime
715 5417 14674651 prime
721 5449 14848523 prime
737 5581 15576569 prime
749 5689 16185203 prime
753 5717 16344901 prime
757 5749 16528373 prime
768 5849 17108323 prime
776 5897 17390251 prime
796 6101 18614149 prime
798 6121 18736379 prime
805 6197 19204501 prime
809 6217 19328651 prime
811 6229 19403333 prime
827 6353 20183479 prime
843 6521 21264979 prime
852 6581 21658069 prime
857 6653 22134529 prime
868 6733 22670009 prime
870 6761 22858939 prime
873 6781 22994369 prime
881 6841 23403059 prime
902 7013 24594589 prime
911 7109 25272493 prime
919 7193 25873219 prime
928 7253 26306629 prime
932 7309 26714393 prime
944 7457 27807151 prime
974 7681 29502719 prime
979 7717 29779901 prime
986 7789 30338153 prime
988 7817 30556651 prime
995 7877 31027501 prime
1002 7933 31470209 prime
1017 8089 32720003 prime
1019 8101 32817149 prime
1037 8269 34192313 prime
1042 8297 34424251 prime
1048 8369 35024263 prime
1060 8501 36137749 prime
1062 8521 36307979 prime
1076 8641 37337759 prime
1079 8669 37580113 prime
1092 8753 38311879 prime
1101 8837 39050701 prime
1103 8849 39156823 prime
1137 9173 42076549 prime
1146 9241 42702659 prime
1148 9277 43036001 prime
1158 9349 43706573 prime
1160 9377 43968751 prime
1162 9397 44156501 prime
1164 9413 44306989 prime
1168 9433 44495459 prime
1174 9473 44873599 prime
1180 9533 45443809 prime
1192 9649 46556423 prime
1196 9689 46943203 prime
1197 9697 47020751 prime
1229 9973 49735349 prime