cp's OEIS Frontend

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.

A056789 a(n) = Sum_{k=1..n} lcm(k,n)/gcd(k,n).

Table of values

n a(n)
1 1
2 3
3 10
4 19
5 51
6 48
7 148
8 147
9 253
10 253
11 606
12 352
13 1015
14 738
15 960
16 1171
17 2313
18 1263
19 3250
20 1869
21 2803
22 3028
23 5820
24 2784
25 6301
26 5073
27 6814
28 5458
29 11775
30 4798
31 14416
32 9363
33 11505
34 11563
35 14898
36 9343
37 24643
38 16248
39 19276
40 14797
41 33621
42 14013
43 38830

List of values

[1, 3, 10, 19, 51, 48, 148, 147, 253, 253, 606, 352, 1015, 738, 960, 1171, 2313, 1263, 3250, 1869, 2803, 3028, 5820, 2784, 6301, 5073, 6814, 5458, 11775, 4798, 14416, 9363, 11505, 11563, 14898, 9343, 24643, 16248, 19276, 14797, 33621, 14013, 38830]

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

Content is available under The OEIS End-User License Agreement.