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.

A225784 Denominators of the sum of the reciprocals of the Collatz (3x+1) sequence beginning at n.

Table of values

n a(n)
1 1
2 2
3 240
4 4
5 80
6 80
7 272272
8 8
9 350064
10 80
11 38896
12 240
13 208
14 272272
15 4095840
16 16
17 3536
18 116688
19 21431696
20 80
21 1344
22 38896
23 1365280
24 80
25 535792400
26 208
27 44841486948146266934850832405421294927083491752830032389039800908293040266400
28 38896
29 1127984
30 1365280

List of values

[1, 2, 240, 4, 80, 80, 272272, 8, 350064, 80, 38896, 240, 208, 272272, 4095840, 16, 3536, 116688, 21431696, 80, 1344, 38896, 1365280, 80, 535792400, 208, 44841486948146266934850832405421294927083491752830032389039800908293040266400, 38896, 1127984, 1365280]

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

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