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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.

A067704 Numbers n such that phi(sigma(n)) = 2*phi(n).

Table of values

n a(n)
1 2
2 6
3 8
4 9
5 24
6 28
7 70
8 78
9 128
10 140
11 222
12 234
13 280
14 312
15 350
16 366
17 384
18 438
19 496
20 525
21 666
22 864
23 888
24 910
25 918
26 936
27 942
28 1036
29 1098
30 1158
31 1232
32 1314
33 1400
34 1464
35 1575
36 1662
37 1708
38 1752
39 1824
40 1836
41 1878
42 1900
43 1938
44 2044
45 2382
46 2480
47 2526
48 2590
49 2664

List of values

[2, 6, 8, 9, 24, 28, 70, 78, 128, 140, 222, 234, 280, 312, 350, 366, 384, 438, 496, 525, 666, 864, 888, 910, 918, 936, 942, 1036, 1098, 1158, 1232, 1314, 1400, 1464, 1575, 1662, 1708, 1752, 1824, 1836, 1878, 1900, 1938, 2044, 2382, 2480, 2526, 2590, 2664]

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

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