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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.

A304521 a(n) is the number of prime powers k such that ceiling(log_2(k)) = n.

Table of values

n a(n)
1 1
2 2
3 3
4 4
5 8
6 9
7 17
8 26
9 47
10 81
11 142
12 264
13 474
14 883
15 1629
16 3045
17 5735
18 10780
19 20429
20 38688
21 73654
22 140426
23 268341
24 513867
25 986034
26 1894410
27 3646135
28 7027826
29 13562626
30 26208249
31 50698866
32 98184468
33 190338062
34 369326691
35 717271794
36 1394198587
37 2712112562

List of values

[1, 2, 3, 4, 8, 9, 17, 26, 47, 81, 142, 264, 474, 883, 1629, 3045, 5735, 10780, 20429, 38688, 73654, 140426, 268341, 513867, 986034, 1894410, 3646135, 7027826, 13562626, 26208249, 50698866, 98184468, 190338062, 369326691, 717271794, 1394198587, 2712112562]

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

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