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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.

A377972 a(n) is the greatest i such that 2n-prime(i) is also a prime, where prime(i) is the i-th prime.

Table of values

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

List of values

[1, 2, 3, 4, 4, 5, 6, 6, 7, 8, 8, 9, 9, 9, 10, 11, 11, 11, 12, 12, 13, 14, 14, 15, 15, 15, 16, 16, 16, 17, 18, 18, 18, 19, 19, 20, 21, 21, 21, 22, 22, 23, 23, 23, 24, 24, 24, 22, 25, 25, 26, 27, 27, 28, 29, 29, 30, 30, 30, 29, 30, 30, 29, 31, 31, 32]

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

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