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.

A208276 Number of Poulet numbers (or pseudoprimes to base 2, A001567) less than 2^n.

Table of values

n a(n)
1 0
2 0
3 0
4 0
5 0
6 0
7 0
8 0
9 1
10 3
11 8
12 13
13 19
14 32
15 45
16 64
17 89
18 124
19 175
20 251
21 361
22 502
23 693
24 944
25 1264
26 1713
27 2361
28 3169
29 4232
30 5749
31 7750
32 10403
33 14011
34 18667
35 24958
36 33389
37 44540
38 59565
39 79343
40 105659
41 141147
42 188231
43 250568
44 333737
45 445316
46 593366
47 792172
48 1059097
49 1416055
50 1893726
51 2532703
52 3390284
53 4540673
54 6086093
55 8167163
56 10964612
57 14731767
58 19806649
59 26651383
60 35893886
61 48374139
62 65247459
63 88069251
64 118968378

List of values

[0, 0, 0, 0, 0, 0, 0, 0, 1, 3, 8, 13, 19, 32, 45, 64, 89, 124, 175, 251, 361, 502, 693, 944, 1264, 1713, 2361, 3169, 4232, 5749, 7750, 10403, 14011, 18667, 24958, 33389, 44540, 59565, 79343, 105659, 141147, 188231, 250568, 333737, 445316, 593366, 792172, 1059097, 1416055, 1893726, 2532703, 3390284, 4540673, 6086093, 8167163, 10964612, 14731767, 19806649, 26651383, 35893886, 48374139, 65247459, 88069251, 118968378]

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

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