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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.

A248746 a(n) is the index k of the greatest prime divisor A002313(k) of n^2 + 1.

Table of values

n a(n)
1 1
2 2
3 2
4 4
5 3
6 6
7 2
8 3
9 7
10 13
11 9
12 5
13 4
14 22
15 15
16 26
17 5
18 3
19 20
20 39
21 4
22 12
23 8
24 51
25 31
26 60
27 10
28 18
29 41
30 8
31 6
32 7
33 14
34 11
35 54
36 105
37 16
38 4
39 65
40 121
41 5
42 35
43 6
44 17
45 83
46 10
47 4
48 45
49 97
50 9
51 106
52 48
53 29
54 209
55 11
56 221
57 3
58 59
59 133
60 28
61 138
62 66
63 38
64 25
65 155
66 294
67 43
68 6
69 174
70 5

List of values

[1, 2, 2, 4, 3, 6, 2, 3, 7, 13, 9, 5, 4, 22, 15, 26, 5, 3, 20, 39, 4, 12, 8, 51, 31, 60, 10, 18, 41, 8, 6, 7, 14, 11, 54, 105, 16, 4, 65, 121, 5, 35, 6, 17, 83, 10, 4, 45, 97, 9, 106, 48, 29, 209, 11, 221, 3, 59, 133, 28, 138, 66, 38, 25, 155, 294, 43, 6, 174, 5]

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

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