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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.

A379520 Denominators of the partial alternating sums of the reciprocals of the unitary totient function (A047994).

Table of values

n a(n)
1 1
2 1
3 2
4 6
5 12
6 12
7 12
8 84
9 168
10 168
11 840
12 840
13 280
14 840
15 105
16 105
17 1680
18 1680
19 5040
20 5040
21 5040
22 5040
23 55440
24 55440
25 55440
26 55440
27 720720
28 80080
29 80080
30 80080
31 240240
32 7447440
33 7447440
34 3723720
35 620620
36 3723720
37 11171160
38 11171160
39 1396395
40 5585580
41 2234232
42 2234232

List of values

[1, 1, 2, 6, 12, 12, 12, 84, 168, 168, 840, 840, 280, 840, 105, 105, 1680, 1680, 5040, 5040, 5040, 5040, 55440, 55440, 55440, 55440, 720720, 80080, 80080, 80080, 240240, 7447440, 7447440, 3723720, 620620, 3723720, 11171160, 11171160, 1396395, 5585580, 2234232, 2234232]

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

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