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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.

A036539 a(n) is the number of numbers k with 2^(n-1) < k <= 2^n having a number of divisors that is a power of 2.

Table of values

n a(n)
1 1
2 1
3 4
4 5
5 11
6 22
7 44
8 89
9 178
10 351
11 702
12 1413
13 2817
14 5634
15 11273
16 22542
17 45077
18 90150
19 180322
20 360621
21 721233
22 1442482
23 2884968
24 5769917
25 11539863
26 23079674
27 46159310
28 92318616
29 184637146
30 369274400
31 738548882
32 1477097703
33 2954195153
34 5908390134
35 11816780283

List of values

[1, 1, 4, 5, 11, 22, 44, 89, 178, 351, 702, 1413, 2817, 5634, 11273, 22542, 45077, 90150, 180322, 360621, 721233, 1442482, 2884968, 5769917, 11539863, 23079674, 46159310, 92318616, 184637146, 369274400, 738548882, 1477097703, 2954195153, 5908390134, 11816780283]

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

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