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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.

A138965 Least prime factor of concatenation of first n odd numbers.

Table of values

n a(n)
1 1
2 13
3 3
4 23
5 37
6 3
7 11617
8 5
9 3
10 135791113151719
11 29
12 3
13 5
14 11
15 3
16 135791113151719212325272931
17 17
18 3
19 7
20 13
21 3
22 131
23 5
24 3
25 11
26 25471443030907588399109
27 3
28 5
29 7
30 3
31 181
32 41
33 3
34 135791113151719212325272931333537394143454749515355575961636567
35 19
36 3
37 40351
38 5
39 3
40 7
41 11
42 3
43 5
44 57041
45 3
46 351269
47 11
48 3
49 135791113151719212325272931333537394143454749515355575961636567697173757779818385878991939597

List of values

[1, 13, 3, 23, 37, 3, 11617, 5, 3, 135791113151719, 29, 3, 5, 11, 3, 135791113151719212325272931, 17, 3, 7, 13, 3, 131, 5, 3, 11, 25471443030907588399109, 3, 5, 7, 3, 181, 41, 3, 135791113151719212325272931333537394143454749515355575961636567, 19, 3, 40351, 5, 3, 7, 11, 3, 5, 57041, 3, 351269, 11, 3, 135791113151719212325272931333537394143454749515355575961636567697173757779818385878991939597]

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