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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.

A061019 Negate primes in factorization of n.

Table of values

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

List of values

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

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