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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.

A176554 Numbers n such that concatenations of divisors of n are nonprime.

Table of values

n a(n)
1 1
2 2
3 4
4 5
5 6
6 8
7 10
8 11
9 12
10 14
11 15
12 16
13 17
14 18
15 19
16 20
17 22
18 23
19 24
20 25
21 26
22 27
23 28
24 29
25 30
26 32
27 33
28 34
29 35
30 36
31 38
32 39
33 40
34 41
35 42
36 43
37 44
38 45
39 46
40 47
41 48
42 49
43 50
44 51
45 52
46 53
47 54
48 55
49 56
50 57
51 58
52 59
53 60
54 61
55 62
56 63
57 64
58 65
59 66
60 68
61 69
62 70
63 71
64 72
65 74
66 75
67 76
68 77
69 78
70 80
71 81

List of values

[1, 2, 4, 5, 6, 8, 10, 11, 12, 14, 15, 16, 17, 18, 19, 20, 22, 23, 24, 25, 26, 27, 28, 29, 30, 32, 33, 34, 35, 36, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 68, 69, 70, 71, 72, 74, 75, 76, 77, 78, 80, 81]

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

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