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A072192 Indices of Sophie Germain primes: p and 2p+1 are primes.

Table of values

n a(n)
1 1
2 2
3 3
4 5
5 9
6 10
7 13
8 16
9 23
10 24
11 30
12 32
13 40
14 41
15 43
16 51
17 52
18 54
19 60
20 62
21 72
22 81
23 83
24 86
25 94
26 97
27 108
28 116
29 119
30 120
31 124
32 128
33 132
34 135
35 140
36 156
37 162
38 170
39 171
40 173
41 176
42 185
43 200
44 201
45 209
46 223
47 228
48 230
49 234
50 239
51 240
52 246

List of values

[1, 2, 3, 5, 9, 10, 13, 16, 23, 24, 30, 32, 40, 41, 43, 51, 52, 54, 60, 62, 72, 81, 83, 86, 94, 97, 108, 116, 119, 120, 124, 128, 132, 135, 140, 156, 162, 170, 171, 173, 176, 185, 200, 201, 209, 223, 228, 230, 234, 239, 240, 246]