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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.

A172348 Index k of the semiprime A001358(k) = prime(n) * prime(n+1).

Table of values

n a(n)
1 2
2 6
3 13
4 26
5 48
6 75
7 103
8 135
9 199
10 270
11 338
12 443
13 508
14 581
15 706
16 878
17 1001
18 1124
19 1305
20 1413
21 1565
22 1764
23 1978
24 2299
25 2571
26 2724
27 2886
28 3052
29 3213
30 3710
31 4259
32 4581
33 4859
34 5259
35 5668
36 5954
37 6409
38 6797
39 7184
40 7696
41 8029
42 8515
43 9062
44 9325
45 9608
46 10246
47 11444

List of values

[2, 6, 13, 26, 48, 75, 103, 135, 199, 270, 338, 443, 508, 581, 706, 878, 1001, 1124, 1305, 1413, 1565, 1764, 1978, 2299, 2571, 2724, 2886, 3052, 3213, 3710, 4259, 4581, 4859, 5259, 5668, 5954, 6409, 6797, 7184, 7696, 8029, 8515, 9062, 9325, 9608, 10246, 11444]

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

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