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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.

A199818 Odd numbers producing 20 even numbers in the Collatz iteration.

Table of values

n a(n)
1 43
2 131
3 133
4 397
5 405
6 433
7 435
8 441
9 475
10 1237
11 1251
12 1285
13 1301
14 1313
15 1325
16 1339
17 1425
18 1427
19 1431
20 1433
21 3861
22 3925
23 3939
24 3941
25 3981
26 4017
27 4019
28 4043
29 4277
30 4293
31 4297
32 4301
33 11605
34 11829
35 12053
36 12131
37 12133
38 12853
39 12885
40 12893
41 12913
42 12931
43 36181

List of values

[43, 131, 133, 397, 405, 433, 435, 441, 475, 1237, 1251, 1285, 1301, 1313, 1325, 1339, 1425, 1427, 1431, 1433, 3861, 3925, 3939, 3941, 3981, 4017, 4019, 4043, 4277, 4293, 4297, 4301, 11605, 11829, 12053, 12131, 12133, 12853, 12885, 12893, 12913, 12931, 36181]

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

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