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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.

A212718 Denominator of Sum_{k=1..n} 1/sigma(k).

Table of values

n a(n)
1 1
2 3
3 12
4 84
5 28
6 42
7 168
8 280
9 3640
10 32760
11 32760
12 32760
13 4680
14 1170
15 4680
16 145080
17 145080
18 145080
19 145080
20 1015560
21 4062240
22 4062240
23 4062240
24 4062240
25 4062240
26 4062240
27 4062240
28 4062240
29 4062240
30 4062240
31 2031120
32 2031120
33 1015560
34 3046680
35 6093360
36 6093360

List of values

[1, 3, 12, 84, 28, 42, 168, 280, 3640, 32760, 32760, 32760, 4680, 1170, 4680, 145080, 145080, 145080, 145080, 1015560, 4062240, 4062240, 4062240, 4062240, 4062240, 4062240, 4062240, 4062240, 4062240, 4062240, 2031120, 2031120, 1015560, 3046680, 6093360, 6093360]

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

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