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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.

A137589 a(n) is the integer that results after deletion of all digits of n-th prime, except the initial digit and the final digit.

Table of values

n a(n)
1 2
2 3
3 5
4 7
5 11
6 13
7 17
8 19
9 23
10 29
11 31
12 37
13 41
14 43
15 47
16 53
17 59
18 61
19 67
20 71
21 73
22 79
23 83
24 89
25 97
26 11
27 13
28 17
29 19
30 13
31 17
32 11
33 17
34 19
35 19
36 11
37 17
38 13
39 17
40 13
41 19
42 11
43 11
44 13
45 17
46 19
47 21
48 23
49 27
50 29
51 23
52 29
53 21
54 21
55 27
56 23
57 29
58 21
59 27
60 21
61 23
62 23
63 37
64 31
65 33
66 37
67 31
68 37
69 37
70 39
71 33

List of values

[2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 11, 13, 17, 19, 13, 17, 11, 17, 19, 19, 11, 17, 13, 17, 13, 19, 11, 11, 13, 17, 19, 21, 23, 27, 29, 23, 29, 21, 21, 27, 23, 29, 21, 27, 21, 23, 23, 37, 31, 33, 37, 31, 37, 37, 39, 33]

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

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