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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.

A210665 Least semiprime dividing digit reversal of n-th semiprime, or 0 if no such factor.

Table of values

n a(n)
1 4
2 6
3 9
4 0
5 0
6 51
7 4
8 22
9 4
10 62
11 33
12 0
13 0
14 0
15 93
16 4
17 94
18 15
19 55
20 15
21 85
22 26
23 4
24 4
25 0
26 77
27 4
28 58
29 4
30 6
31 0
32 39
33 49
34 0
35 0
36 111
37 511
38 0
39 0
40 121
41 221
42 321
43 921
44 0
45 0
46 141
47 0
48 341
49 0
50 0
51 551
52 851
53 951
54 161
55 0
56 961
57 771
58 871
59 381
60 581
61 781
62 0
63 6
64 202
65 302
66 502
67 14

List of values

[4, 6, 9, 0, 0, 51, 4, 22, 4, 62, 33, 0, 0, 0, 93, 4, 94, 15, 55, 15, 85, 26, 4, 4, 0, 77, 4, 58, 4, 6, 0, 39, 49, 0, 0, 111, 511, 0, 0, 121, 221, 321, 921, 0, 0, 141, 0, 341, 0, 0, 551, 851, 951, 161, 0, 961, 771, 871, 381, 581, 781, 0, 6, 202, 302, 502, 14]

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

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