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.

A069602 a(1) = 1; a(n) = smallest composite number such that the juxtaposition a(1)a(2)...a(n) is a prime.

Table of values

n a(n)
1 1
2 9
3 9
4 9
5 21
6 9
7 51
8 21
9 9
10 57
11 301
12 51
13 51
14 33
15 209
16 111
17 87
18 153
19 121
20 87
21 63
22 39
23 77
24 27
25 57
26 81
27 129
28 147
29 111
30 21
31 147
32 321
33 69
34 93
35 153
36 621
37 817
38 129
39 81
40 803
41 129
42 153
43 451
44 171
45 717
46 801
47 959
48 459
49 187
50 291
51 231
52 533
53 399
54 291
55 289
56 869
57 489
58 171
59 381
60 667
61 21

List of values

[1, 9, 9, 9, 21, 9, 51, 21, 9, 57, 301, 51, 51, 33, 209, 111, 87, 153, 121, 87, 63, 39, 77, 27, 57, 81, 129, 147, 111, 21, 147, 321, 69, 93, 153, 621, 817, 129, 81, 803, 129, 153, 451, 171, 717, 801, 959, 459, 187, 291, 231, 533, 399, 291, 289, 869, 489, 171, 381, 667, 21]

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

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