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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.

A089787 a(4n-3), a(4n-2), a(4n-1), and a(4n) are the units digit of the n-th prime followed by 1, 3, 7, and 9 respectively.

Table of values

n a(n)
1 21
2 23
3 27
4 29
5 31
6 33
7 37
8 39
9 51
10 53
11 57
12 59
13 71
14 73
15 77
16 79
17 11
18 13
19 17
20 19
21 31
22 33
23 37
24 39
25 71
26 73
27 77
28 79
29 91
30 93
31 97
32 99
33 31
34 33
35 37
36 39
37 91
38 93
39 97
40 99
41 11
42 13
43 17
44 19
45 71
46 73
47 77
48 79
49 11
50 13
51 17
52 19
53 31
54 33
55 37
56 39
57 71
58 73
59 77
60 79
61 31
62 33
63 37
64 39
65 91
66 93
67 97
68 99
69 11

List of values

[21, 23, 27, 29, 31, 33, 37, 39, 51, 53, 57, 59, 71, 73, 77, 79, 11, 13, 17, 19, 31, 33, 37, 39, 71, 73, 77, 79, 91, 93, 97, 99, 31, 33, 37, 39, 91, 93, 97, 99, 11, 13, 17, 19, 71, 73, 77, 79, 11, 13, 17, 19, 31, 33, 37, 39, 71, 73, 77, 79, 31, 33, 37, 39, 91, 93, 97, 99, 11]

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

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