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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.

A005579 a(n) = smallest number k such that Product_{i=1..k} prime(i)/(prime(i)-1) > n.

Table of values

n a(n)
0 0
1 1
2 2
3 3
4 4
5 6
6 9
7 14
8 22
9 35
10 55
11 89
12 142
13 230
14 373
15 609
16 996
17 1637
18 2698
19 4461
20 7398
21 12301
22 20503
23 34253
24 57348
25 96198
26 161659
27 272124
28 458789
29 774616
30 1309627
31 2216968
32 3757384
33 6375166
34 10828012
35 18409028
36 31326514
37 53354259
38 90945529
39 155142139

List of values

[0, 1, 2, 3, 4, 6, 9, 14, 22, 35, 55, 89, 142, 230, 373, 609, 996, 1637, 2698, 4461, 7398, 12301, 20503, 34253, 57348, 96198, 161659, 272124, 458789, 774616, 1309627, 2216968, 3757384, 6375166, 10828012, 18409028, 31326514, 53354259, 90945529, 155142139]

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

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