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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.

A171798 a(n) = base-10 concatenation XYZ, where X = number of bits in binary expansion of n, Y = number of 0's, Z = number of 1's.

Table of values

n a(n)
1 101
2 211
3 202
4 321
5 312
6 312
7 303
8 431
9 422
10 422
11 413
12 422
13 413
14 413
15 404
16 541
17 532
18 532
19 523
20 532
21 523
22 523
23 514
24 532
25 523
26 523
27 514
28 523
29 514
30 514
31 505
32 651
33 642
34 642
35 633
36 642
37 633
38 633
39 624
40 642
41 633
42 633
43 624
44 633
45 624
46 624
47 615
48 642
49 633
50 633
51 624

List of values

[101, 211, 202, 321, 312, 312, 303, 431, 422, 422, 413, 422, 413, 413, 404, 541, 532, 532, 523, 532, 523, 523, 514, 532, 523, 523, 514, 523, 514, 514, 505, 651, 642, 642, 633, 642, 633, 633, 624, 642, 633, 633, 624, 633, 624, 624, 615, 642, 633, 633, 624]

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

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