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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.

A071321 Alternating sum of all prime factors of n; primes nondecreasing, starting with the least prime factor: A020639(n).

Table of values

n a(n)
1 0
2 2
3 3
4 0
5 5
6 -1
7 7
8 2
9 0
10 -3
11 11
12 3
13 13
14 -5
15 -2
16 0
17 17
18 2
19 19
20 5
21 -4
22 -9
23 23
24 -1
25 0
26 -11
27 3
28 7
29 29
30 4
31 31
32 2
33 -8
34 -15
35 -2
36 0
37 37
38 -17
39 -10
40 -3
41 41
42 6
43 43
44 11
45 5
46 -21
47 47
48 3
49 0
50 2
51 -14
52 13
53 53
54 -1
55 -6
56 -5
57 -16
58 -27
59 59
60 -2
61 61
62 -29
63 7
64 0
65 -8

List of values

[0, 2, 3, 0, 5, -1, 7, 2, 0, -3, 11, 3, 13, -5, -2, 0, 17, 2, 19, 5, -4, -9, 23, -1, 0, -11, 3, 7, 29, 4, 31, 2, -8, -15, -2, 0, 37, -17, -10, -3, 41, 6, 43, 11, 5, -21, 47, 3, 0, 2, -14, 13, 53, -1, -6, -5, -16, -27, 59, -2, 61, -29, 7, 0, -8]

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

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