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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.

A162145 a(n) = the number of noncomposites (primes or 1) that are n digits long when written in binary.

Table of values

n a(n)
1 1
2 2
3 2
4 2
5 5
6 7
7 13
8 23
9 43
10 75
11 137
12 255
13 464
14 872
15 1612
16 3030
17 5709
18 10749
19 20390
20 38635
21 73586
22 140336
23 268216
24 513708
25 985818
26 1894120
27 3645744
28 7027290
29 13561907
30 26207278
31 50697537
32 98182656
33 190335585
34 369323305
35 717267168

List of values

[1, 2, 2, 2, 5, 7, 13, 23, 43, 75, 137, 255, 464, 872, 1612, 3030, 5709, 10749, 20390, 38635, 73586, 140336, 268216, 513708, 985818, 1894120, 3645744, 7027290, 13561907, 26207278, 50697537, 98182656, 190335585, 369323305, 717267168]

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

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