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.

A287055 Numbers n such that uphi(n) = uphi(n+1), where uphi(n) is the unitary totient function (A047994).

Table of values

n a(n)
1 1
2 20
3 35
4 143
5 194
6 208
7 740
8 1119
9 1220
10 1299
11 1419
12 1803
13 1892
14 2232
15 2623
16 3705
17 3716
18 3843
19 4995
20 5031
21 5183
22 5186
23 5635
24 7868
25 10659
26 17948
27 18507
28 18914
29 21007
30 23616
31 25388
32 25545
33 30380
34 30744
35 31599
36 32304
37 34595
38 37820
39 38024
40 47067
41 60767
42 70394

List of values

[1, 20, 35, 143, 194, 208, 740, 1119, 1220, 1299, 1419, 1803, 1892, 2232, 2623, 3705, 3716, 3843, 4995, 5031, 5183, 5186, 5635, 7868, 10659, 17948, 18507, 18914, 21007, 23616, 25388, 25545, 30380, 30744, 31599, 32304, 34595, 37820, 38024, 47067, 60767, 70394]

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

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