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发表于 2019-6-13 17:47
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本帖最后由 蔡家雄 于 2021-7-20 07:58 编辑
定义:若 15k±2 和 15k±4 是 四生素数,则称 15k 为 双中数。
奇数双中比猜想:一奇数均可表为两个双中数之比。
3 = 83226465 /27742155,
5 = 335769525 /67153905,
7 = 105 /15,
7 = 12812415 /1830345,
7 = 198328725 /28332675,
7 = 232772925 /33253275,
7 = 639984345 /91426335,
9 = 163690065 /18187785,
11 = 167563935 /15233085,
11 = 355547115 /32322465,
11 = 465281355 /42298305,
11 = 530037585 /48185235,
11 = 939524355 /85411305,
13 = 195 /15,
13 = 29332485 /2256345,
13 = 111730905 /8594685,
13 = 236441205 /18187785,
13 = 273511875 /21039375,
13 = 504179325 /38783025,
13 = 535519335 /41193795,
13 = 629859945 /48450765,
13 = 689057265 /53004405,
13 = 1052584455 /80968035,
13 = 1112223645 /85555665,
15 = 22275 /1485,
15 = 5922225 /394815,
15 = 92043225 /6136215,
15 = 235840725 /15722715,
15 = 453530925 /30235395,
15 = 1114341075 /74289405,
17 = 55335 /3255,
17 = 570791235 /33575955,
17 = 1610046795 /94708635,
19 = 277011735 /14579565,
19 = 331435335 /17443965,
19 = 396695775 /20878725,
—— 外国人没研究过,,,,,,,,
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