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.

A367805 a(1) = 0; for n > 1, a(n) is the least positive integer k for which k*prime(n) + 2 is prime.

Table of values

n a(n)
1 0
2 1
3 1
4 3
5 1
6 3
7 1
8 3
9 3
10 1
11 5
12 3
13 1
14 3
15 7
16 7
17 1
18 5
19 5
20 1
21 5
22 3
23 3
24 3
25 3
26 1
27 3
28 1
29 5
30 9
31 3
32 7
33 1
34 3
35 1
36 5
37 5
38 3
39 3
40 3
41 1
42 5
43 1
44 5
45 1
46 3
47 9
48 5
49 1
50 9
51 3
52 1
53 15
54 7
55 3
56 15
57 1
58 9
59 11
60 1
61 9
62 3
63 21
64 1
65 3
66 3
67 5
68 3
69 1
70 3
71 3
72 15
73 3
74 5
75 9
76 3
77 13
78 3
79 19
80 3
81 1
82 15
83 1
84 3
85 3
86 9
87 13
88 3
89 1
90 15

List of values

[0, 1, 1, 3, 1, 3, 1, 3, 3, 1, 5, 3, 1, 3, 7, 7, 1, 5, 5, 1, 5, 3, 3, 3, 3, 1, 3, 1, 5, 9, 3, 7, 1, 3, 1, 5, 5, 3, 3, 3, 1, 5, 1, 5, 1, 3, 9, 5, 1, 9, 3, 1, 15, 7, 3, 15, 1, 9, 11, 1, 9, 3, 21, 1, 3, 3, 5, 3, 1, 3, 3, 15, 3, 5, 9, 3, 13, 3, 19, 3, 1, 15, 1, 3, 3, 9, 13, 3, 1, 15]