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发表于 2025-8-14 12:13
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A000849-19
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
1 1
2 3
3 10
4 46
5 343
6 3248
7 42331
8 646029
9 12283531
10 300369796
11 8028643010
12 259488750744
13 9414916809095
14 362597750396740
15 15397728527812858
16 742238179058722891
17 40068968501510691894
18 2251262473052300960826
19 139566579945945392719413
A000882-15
Number of twin prime pairs <= product of first n primes.
0, 1, 4, 15, 69, 468, 4636, 57453, 896062, 18463713, 425177757, 11997649372, 385088898632, 13280323588034, 509456736126003
1 0
2 1
3 4
4 15
5 69
6 468
7 4636
8 57453
9 896062
10 18463713
11 425177757
12 11997649372
13 385088898632
14 13280323588034
15 509456736126003
A002110-350
Primorial numbers (first definition): product of first n primes. Sometimes written prime(n)#.
1, 2, 6, 30, 210, 2310, 30030, 510510, 9699690, 223092870, 6469693230, 200560490130, 7420738134810, 304250263527210, 13082761331670030, 614889782588491410, 32589158477190044730, 1922760350154212639070, 117288381359406970983270, 7858321551080267055879090
0 1
1 2
2 6
3 30
4 210
5 2310
6 30030
7 510510
8 9699690
9 223092870
10 6469693230
11 200560490130
12 7420738134810
13 304250263527210
14 13082761331670030
15 614889782588491410
16 32589158477190044730
17 1922760350154212639070
18 117288381359406970983270
19 7858321551080267055879090
20 557940830126698960967415390
……
350
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