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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A228171 Least prime such that between it and the next prime there are exactly n semiprimes.

Table of values

n a(n)
0 2
1 3
2 7
3 31
4 89
5 139
6 113
7 211
8 1381
9 1637
10 1129
11 2557
12 2971
13 1327
14 15683
15 16141
16 9973
17 35677
18 34061
19 43331
20 19609
21 107377
22 162143
23 44293
24 404597
25 461717
26 838249
27 155921
28 535399
29 492113
30 396733
31 2181737
32 370261
33 1468277
34 6034247
35 3933599
36 1671781
37 25180171

List of values

[2, 3, 7, 31, 89, 139, 113, 211, 1381, 1637, 1129, 2557, 2971, 1327, 15683, 16141, 9973, 35677, 34061, 43331, 19609, 107377, 162143, 44293, 404597, 461717, 838249, 155921, 535399, 492113, 396733, 2181737, 370261, 1468277, 6034247, 3933599, 1671781, 25180171]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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