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.

A085818 For n > 1: a(n) = p if n = p^e with p prime and e > 1, otherwise a(n) = (n-m)-th prime, where m = number of nonprime prime powers <= n; a(1)=1.

Table of values

n a(n)
1 1
2 2
3 3
4 2
5 5
6 7
7 11
8 2
9 3
10 13
11 17
12 19
13 23
14 29
15 31
16 2
17 37
18 41
19 43
20 47
21 53
22 59
23 61
24 67
25 5
26 71
27 3
28 73
29 79
30 83
31 89
32 2
33 97
34 101
35 103
36 107
37 109
38 113
39 127
40 131
41 137
42 139
43 149
44 151
45 157
46 163
47 167
48 173
49 7
50 179
51 181
52 191
53 193
54 197
55 199
56 211
57 223
58 227
59 229
60 233
61 239
62 241

List of values

[1, 2, 3, 2, 5, 7, 11, 2, 3, 13, 17, 19, 23, 29, 31, 2, 37, 41, 43, 47, 53, 59, 61, 67, 5, 71, 3, 73, 79, 83, 89, 2, 97, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173, 7, 179, 181, 191, 193, 197, 199, 211, 223, 227, 229, 233, 239, 241]

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

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