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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.

A196871 Numbers having no odd primes in their Collatz (3x+1) trajectory.

Table of values

n a(n)
1 1
2 2
3 4
4 8
5 16
6 21
7 32
8 42
9 64
10 84
11 85
12 128
13 168
14 170
15 256
16 336
17 340
18 341
19 453
20 512
21 672
22 680
23 682
24 906
25 909
26 1024
27 1344
28 1360
29 1364
30 1365
31 1812
32 1813
33 1818
34 2048
35 2688
36 2720
37 2728
38 2730
39 3624
40 3626
41 3636
42 4096
43 5376
44 5440
45 5456
46 5460
47 5461
48 7248
49 7252
50 7272

List of values

[1, 2, 4, 8, 16, 21, 32, 42, 64, 84, 85, 128, 168, 170, 256, 336, 340, 341, 453, 512, 672, 680, 682, 906, 909, 1024, 1344, 1360, 1364, 1365, 1812, 1813, 1818, 2048, 2688, 2720, 2728, 2730, 3624, 3626, 3636, 4096, 5376, 5440, 5456, 5460, 5461, 7248, 7252, 7272]

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

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