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.

A217373 Numbers n the representation of which in base 3 ends in 2*k or 2*k+1 zeros, where k is odd.

Table of values

n a(n)
1 9
2 18
3 27
4 36
5 45
6 54
7 63
8 72
9 90
10 99
11 108
12 117
13 126
14 135
15 144
16 153
17 171
18 180
19 189
20 198
21 207
22 216
23 225
24 234
25 252
26 261
27 270
28 279
29 288
30 297
31 306
32 315
33 333
34 342
35 351
36 360
37 369
38 378
39 387
40 396
41 414
42 423
43 432
44 441
45 450
46 459
47 468
48 477
49 495
50 504
51 513
52 522
53 531
54 540

List of values

[9, 18, 27, 36, 45, 54, 63, 72, 90, 99, 108, 117, 126, 135, 144, 153, 171, 180, 189, 198, 207, 216, 225, 234, 252, 261, 270, 279, 288, 297, 306, 315, 333, 342, 351, 360, 369, 378, 387, 396, 414, 423, 432, 441, 450, 459, 468, 477, 495, 504, 513, 522, 531, 540]

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

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