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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.

A070801 Largest prime <= sigma(n): a(n) = prevprime(sigma(n)), where prevprime(n) = A007917(n), the largest prime less than or equal to n.

Table of values

n a(n)
2 3
3 3
4 7
5 5
6 11
7 7
8 13
9 13
10 17
11 11
12 23
13 13
14 23
15 23
16 31
17 17
18 37
19 19
20 41
21 31
22 31
23 23
24 59
25 31
26 41
27 37
28 53
29 29
30 71
31 31
32 61
33 47
34 53
35 47
36 89
37 37
38 59
39 53
40 89
41 41
42 89
43 43
44 83
45 73
46 71
47 47
48 113
49 53
50 89
51 71
52 97
53 53
54 113
55 71
56 113
57 79
58 89
59 59
60 167
61 61
62 89
63 103
64 127
65 83
66 139
67 67
68 113
69 89

List of values

[3, 3, 7, 5, 11, 7, 13, 13, 17, 11, 23, 13, 23, 23, 31, 17, 37, 19, 41, 31, 31, 23, 59, 31, 41, 37, 53, 29, 71, 31, 61, 47, 53, 47, 89, 37, 59, 53, 89, 41, 89, 43, 83, 73, 71, 47, 113, 53, 89, 71, 97, 53, 113, 71, 113, 79, 89, 59, 167, 61, 89, 103, 127, 83, 139, 67, 113, 89]

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

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