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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.

A168069 a(n) is the index k of the smallest k-th prime p(k) with f(k,n):=(p(k) + p(k+1))/n an integer (n = 1,2,3,...)

Table of values

n a(n)
1 1
2 2
3 3
4 2
5 1
6 3
7 8
8 2
9 4
10 6
11 13
12 3
13 9
14 8
15 6
16 16
17 11
18 4
19 21
20 10
21 8
22 13
23 19
24 5
25 14
26 9
27 22
28 16
29 69
30 6
31 24
32 18
33 25
34 11
35 7
36 29
37 21
38 12
39 17

List of values

[1, 2, 3, 2, 1, 3, 8, 2, 4, 6, 13, 3, 9, 8, 6, 16, 11, 4, 21, 10, 8, 13, 19, 5, 14, 9, 22, 16, 69, 6, 24, 18, 25, 11, 7, 29, 21, 12, 17]

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

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