cp's OEIS Frontend

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.

A103669 First occurrence of just n semiprimes occurs between the a(n)-th prime and the next prime.

Table of values

n a(n)
1 1
2 2
3 4
4 11
5 24
6 34
7 30
8 47
9 221
10 259
11 189
12 375
13 429
14 217
15 1831
16 1879
17 1229
18 3795
19 3644
20 4522
21 2225
22 10229
23 14862
24 4612
25 34202
26 38590
27 66762
28 14357
29 44227
30 40933
31 33608
32 161441
33 31545
34 111924
35 415069
36 278832
37 126172
38 1576499
39 104071
40 271743
41 786922
42 3183065
43 4875380
44 3166684
45 2219883
46 6080675
47 6443469
48 1319945

List of values

[1, 2, 4, 11, 24, 34, 30, 47, 221, 259, 189, 375, 429, 217, 1831, 1879, 1229, 3795, 3644, 4522, 2225, 10229, 14862, 4612, 34202, 38590, 66762, 14357, 44227, 40933, 33608, 161441, 31545, 111924, 415069, 278832, 126172, 1576499, 104071, 271743, 786922, 3183065, 4875380, 3166684, 2219883, 6080675, 6443469, 1319945]

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

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