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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.

A051956 a(n) = smallest number > a(n-1) such that a(1)*a(2)*...*a(n) + 1 and a(1)*a(2)*...*a(n) - 1 are primes.

Table of values

n a(n)
1 4
2 15
3 17
4 19
5 29
6 57
7 77
8 285
9 318
10 354
11 379
12 405
13 520
14 521
15 595
16 625
17 938
18 1706
19 1738
20 2085
21 2345
22 2817
23 4319
24 4529
25 7005
26 8207
27 8232
28 9451
29 9839
30 11044
31 11170
32 12386
33 12421
34 12722
35 14153
36 15220
37 15371
38 17052
39 17965
40 18279
41 18811
42 19890
43 21628
44 22667
45 22746

List of values

[4, 15, 17, 19, 29, 57, 77, 285, 318, 354, 379, 405, 520, 521, 595, 625, 938, 1706, 1738, 2085, 2345, 2817, 4319, 4529, 7005, 8207, 8232, 9451, 9839, 11044, 11170, 12386, 12421, 12722, 14153, 15220, 15371, 17052, 17965, 18279, 18811, 19890, 21628, 22667, 22746]

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

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