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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.

A140509 Numbers k such that 5^k-1 contains a divisor which is an overpseudoprime to base 5.

Table of values

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

List of values

[5, 9, 10, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 48, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80]

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

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