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.

A217731 Numbers n such that in Collatz (3x+1) trajectory of n, the number of terms < n equals number of terms > n.

Table of values

n a(n)
1 1
2 19
3 39
4 75
5 201
6 428
7 462
8 550
9 583
10 593
11 638
12 702
13 755
14 1486
15 2395
16 3023
17 3583
18 3867
19 5342
20 6998
21 7419
22 8283
23 10367
24 10447
25 10524
26 10567
27 10879
28 11219
29 12379
30 13647
31 13650
32 14252
33 14561
34 14783
35 15230
36 15871
37 16871
38 16875
39 17121
40 17385
41 18046
42 19279
43 19691

List of values

[1, 19, 39, 75, 201, 428, 462, 550, 583, 593, 638, 702, 755, 1486, 2395, 3023, 3583, 3867, 5342, 6998, 7419, 8283, 10367, 10447, 10524, 10567, 10879, 11219, 12379, 13647, 13650, 14252, 14561, 14783, 15230, 15871, 16871, 16875, 17121, 17385, 18046, 19279, 19691]