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.

A209800 Numbers n such that the concatenation of the distinct prime divisors of n is composite.

Table of values

n a(n)
1 10
2 14
3 15
4 20
5 26
6 28
7 30
8 34
9 35
10 38
11 40
12 42
13 45
14 50
15 52
16 55
17 56
18 57
19 60
20 62
21 65
22 68
23 69
24 74
25 75
26 76
27 77
28 78
29 80
30 84
31 85
32 86
33 87
34 90
35 91
36 94
37 95
38 98
39 100
40 102
41 104
42 105
43 106
44 110
45 112
46 114
47 118
48 119
49 120
50 122
51 123
52 124
53 126
54 129
55 130
56 134
57 135
58 136
59 138
60 143

List of values

[10, 14, 15, 20, 26, 28, 30, 34, 35, 38, 40, 42, 45, 50, 52, 55, 56, 57, 60, 62, 65, 68, 69, 74, 75, 76, 77, 78, 80, 84, 85, 86, 87, 90, 91, 94, 95, 98, 100, 102, 104, 105, 106, 110, 112, 114, 118, 119, 120, 122, 123, 124, 126, 129, 130, 134, 135, 136, 138, 143]

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

Content is available under The OEIS End-User License Agreement.