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.

A068390 Numbers k such that sigma(k) = 4*phi(k).

Table of values

n a(n)
1 14
2 105
3 248
4 418
5 1485
6 3135
7 3596
8 3956
9 4064
10 5396
11 8636
12 20026
13 23374
14 25714
15 35074
16 35343
17 39105
18 41656
19 55154
20 56134
21 56536
22 71145
23 74613
24 87087
25 124605
26 150195
27 175305
28 192855
29 263055
30 393104
31 413655
32 421005
33 474548
34 604012
35 697851
36 711988
37 819772

List of values

[14, 105, 248, 418, 1485, 3135, 3596, 3956, 4064, 5396, 8636, 20026, 23374, 25714, 35074, 35343, 39105, 41656, 55154, 56134, 56536, 71145, 74613, 87087, 124605, 150195, 175305, 192855, 263055, 393104, 413655, 421005, 474548, 604012, 697851, 711988, 819772]