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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.

A163301 a(n) = Sum_{x=n-th even nonprime..n-th odd nonprime} -x*(-1)^x.

Table of values

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

List of values

[1, 3, 5, 7, 8, 8, 10, 10, 11, 13, 14, 14, 15, 15, 17, 17, 18, 20, 20, 21, 22, 22, 23, 23, 23, 24, 26, 28, 29, 29, 29, 29, 29, 29, 30, 31, 31, 33, 33, 33, 33, 35, 35, 36, 36, 37, 38, 38, 39, 39, 41, 41, 41, 41, 43, 45, 45, 45, 45, 45, 46, 46, 46, 46, 46, 47, 49, 50, 50, 52, 52]

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

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