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.

A372636 a(n) = Sum_{j=1..n} Sum_{k=1..n} phi(j*k) / phi(k).

Table of values

n a(n)
1 1
2 5
3 14
4 31
5 58
6 93
7 148
8 219
9 306
10 407
11 550
12 695
13 898
14 1103
15 1323
16 1610
17 1963
18 2293
19 2738
20 3152
21 3597
22 4116
23 4773
24 5362
25 6073
26 6808
27 7611
28 8437
29 9492
30 10348
31 11557
32 12728
33 13868
34 15143
35 16425
36 17753
37 19482
38 21083
39 22687
40 24350
41 26481
42 28186
43 30535
44 32641

List of values

[1, 5, 14, 31, 58, 93, 148, 219, 306, 407, 550, 695, 898, 1103, 1323, 1610, 1963, 2293, 2738, 3152, 3597, 4116, 4773, 5362, 6073, 6808, 7611, 8437, 9492, 10348, 11557, 12728, 13868, 15143, 16425, 17753, 19482, 21083, 22687, 24350, 26481, 28186, 30535, 32641]