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.

A339880 Odd composite numbers k such that A053575(k) [the odd part of phi] divides k-1.

Table of values

n a(n)
1 15
2 51
3 85
4 91
5 255
6 435
7 451
8 561
9 595
10 771
11 1105
12 1261
13 1285
14 1351
15 1695
16 2091
17 2431
18 2465
19 3655
20 3855
21 4369
22 4795
23 5083
24 5151
25 5383
26 6601
27 6643
28 6735
29 7051
30 8245
31 8481
32 8695
33 8911
34 8995
35 9061
36 9605
37 10585
38 11155
39 13107
40 15051
41 15211
42 16405
43 16705
44 17733
45 18721
46 19669
47 20451
48 21845
49 22359
50 23001
51 26335
52 28645

List of values

[15, 51, 85, 91, 255, 435, 451, 561, 595, 771, 1105, 1261, 1285, 1351, 1695, 2091, 2431, 2465, 3655, 3855, 4369, 4795, 5083, 5151, 5383, 6601, 6643, 6735, 7051, 8245, 8481, 8695, 8911, 8995, 9061, 9605, 10585, 11155, 13107, 15051, 15211, 16405, 16705, 17733, 18721, 19669, 20451, 21845, 22359, 23001, 26335, 28645]

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

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