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发表于 2026-8-26 03:18
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A018239给出10个p#+1型素数
Primorial primes: primes of the form 1 + product of first k primes, for some k.
2, 3, 7, 31, 211, 2311, 200560490131……
A014545给出28个p#+1型素数之中p的素数号
Numbers k such that the k-th Euclid number A006862(k) = 1 + (Product of first k primes) is prime.
0, 1, 2, 3, 4, 5, 11, 75, 171, 172, 384, 457, 616, 643, 1391, 1613, 2122, 2647, 2673, 4413, 13494, 31260, 33237, 304723, 365071, 436504, 498865, 637491
第一个0可能是第0个素数阶乘1加1等于2是素数;
第1个素数2的素数阶乘2加1等于3是素数;
第2个素数3的素数阶乘6加1等于7是素数;
第3个素数5的素数阶乘30加1等于31是素数;
第4个素数7的素数阶乘210加1等于211是素数;
第5个素数11的素数阶乘2310加1等于2311是素数;……
A000849给出19个小于等于素数阶乘p#中的素数个数
Number of primes <= product of first n primes, A002110(n).
0, 1, 3, 10, 46, 343, 3248, 42331, 646029, 12283531, 300369796, 8028643010, 259488750744, 9414916809095, 362597750396740, 15397728527812858, 742238179058722891, 40068968501510691894, 2251262473052300960826, 139566579945945392719413
A007014给出350个小于等于素数阶乘p#的最大素数
Largest prime <= Product prime(k).
2, 5, 29, 199, 2309, 30029, 510481, 9699667, 223092827, 6469693189, 200560490057, 7420738134751, 304250263527209, 13082761331669941, 614889782588491343, 32589158477190044657, 1922760350154212638963, 117288381359406970983181, 7858321551080267055878989……
A067021给出25个(编号2-26)小于等于素数阶乘p#平方根的最大素数
Largest prime of which the square still does not exceed the product of first n primes, the n-th primorial.
其平方仍不超过前 n 个质数乘积(即第 n 个素数阶乘)的最大质数。
2, 5, 13, 47, 173, 709, 3109, 14929, 80429, 447829, 2724079, 17442769, 114379879, 784149077, 5708691479, 43849291271, 342473913367, 2803269796331, 23620771158583, 201815957246317, 1793779464521953, 16342108667160251, 154171144824008969, 1518409682511777919, 15259828451149028543
A038710给出350个大于素数阶乘p#的最小素数
a(n) is the smallest prime > product of the first n primes (A002110(n)).
2, 3, 7, 31, 211, 2311, 30047, 510529, 9699713, 223092907, 6469693291, 200560490131, 7420738134871, 304250263527281, 13082761331670077, 614889782588491517, 32589158477190044789, 1922760350154212639131, 117288381359406970983379, 7858321551080267055879179……
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