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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.

A174539 Starting numbers n such that the number of halving and tripling steps to reach 1 under the Collatz 3x+1 map is a perfect square.

Table of values

n a(n)
1 1
2 2
3 7
4 12
5 13
6 16
7 44
8 45
9 46
10 80
11 84
12 85
13 98
14 99
15 100
16 101
17 102
18 107
19 129
20 153
21 156
22 157
23 158
24 169
25 272
26 276
27 277
28 280
29 282
30 300
31 301
32 302
33 350
34 351
35 512
36 576
37 592
38 596
39 597
40 608
41 616
42 618
43 625
44 642
45 643
46 644
47 645
48 646
49 648
50 649
51 650
52 651
53 652
54 653
55 654
56 655
57 662
58 663

List of values

[1, 2, 7, 12, 13, 16, 44, 45, 46, 80, 84, 85, 98, 99, 100, 101, 102, 107, 129, 153, 156, 157, 158, 169, 272, 276, 277, 280, 282, 300, 301, 302, 350, 351, 512, 576, 592, 596, 597, 608, 616, 618, 625, 642, 643, 644, 645, 646, 648, 649, 650, 651, 652, 653, 654, 655, 662, 663]

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

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