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.

A133133 a(n) is the largest prime factor of the sum of the largest prime factors of numbers from 2 to n.

Table of values

n a(n)
2 2
3 5
4 7
5 3
6 5
7 11
8 3
9 3
10 2
11 43
12 23
13 59
14 11
15 71
16 73
17 5
18 31
19 7
20 13
21 31
22 5
23 79
24 23
25 83
26 179
27 13
28 7
29 109
30 223
31 127
32 2
33 89
34 71
35 97
36 7
37 331
38 7
39 11
40 23
41 409
42 13
43 17
44 47
45 19
46 83
47 109
48 137
49 37
50 7
51 577
52 59
53 643
54 19
55 73
56 83
57 683
58 89
59 257
60 97
61 31
62 31
63 7
64 877
65 89
66 53
67 11
68 197
69 7
70 29
71 181
72 11

List of values

[2, 5, 7, 3, 5, 11, 3, 3, 2, 43, 23, 59, 11, 71, 73, 5, 31, 7, 13, 31, 5, 79, 23, 83, 179, 13, 7, 109, 223, 127, 2, 89, 71, 97, 7, 331, 7, 11, 23, 409, 13, 17, 47, 19, 83, 109, 137, 37, 7, 577, 59, 643, 19, 73, 83, 683, 89, 257, 97, 31, 31, 7, 877, 89, 53, 11, 197, 7, 29, 181, 11]

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

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