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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.

A162888 An alternating sum of the first n nonprimes.

Table of values

n a(n)
1 1
2 3
3 3
4 4
5 5
6 15
7 6
8 7
9 8
10 24
11 9
12 10
13 11
14 33
15 12
16 13
17 39
18 14
19 42
20 15
21 16
22 17
23 51
24 18
25 54
26 19
27 20
28 60
29 21
30 22
31 23
32 69
33 24
34 25
35 75
36 26
37 78
38 27
39 28
40 84
41 29
42 87
43 30
44 31
45 32
46 96
47 33
48 99
49 34
50 35
51 105
52 36
53 37
54 38
55 114
56 39
57 117
58 40
59 41
60 123
61 42
62 43
63 129
64 44
65 132
66 45
67 46
68 138
69 47
70 141

List of values

[1, 3, 3, 4, 5, 15, 6, 7, 8, 24, 9, 10, 11, 33, 12, 13, 39, 14, 42, 15, 16, 17, 51, 18, 54, 19, 20, 60, 21, 22, 23, 69, 24, 25, 75, 26, 78, 27, 28, 84, 29, 87, 30, 31, 32, 96, 33, 99, 34, 35, 105, 36, 37, 38, 114, 39, 117, 40, 41, 123, 42, 43, 129, 44, 132, 45, 46, 138, 47, 141]

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

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