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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.

A225878 Numbers n such that the products n*(sum of the reciprocals of the Collatz (3x+1) sequence beginning at n) are integers.

Table of values

n a(n)
1 1
2 2
3 4
4 8
5 16
6 32
7 64
8 80
9 128
10 160
11 208
12 256
13 320
14 416
15 512
16 640
17 832
18 1024
19 1280
20 1344
21 1664
22 2048
23 2560
24 2688
25 3328
26 4096
27 5120
28 5376
29 6656
30 8192
31 10240
32 10752
33 13312
34 16384
35 20480
36 21504
37 21760
38 26624
39 27264
40 32768
41 40960
42 43008
43 43520
44 53248
45 54528

List of values

[1, 2, 4, 8, 16, 32, 64, 80, 128, 160, 208, 256, 320, 416, 512, 640, 832, 1024, 1280, 1344, 1664, 2048, 2560, 2688, 3328, 4096, 5120, 5376, 6656, 8192, 10240, 10752, 13312, 16384, 20480, 21504, 21760, 26624, 27264, 32768, 40960, 43008, 43520, 53248, 54528]

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

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