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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.

A083847 a(n) = number of primes of the form x^2 + 1 <= 2^n.

Table of values

n a(n)
1 1
2 1
3 2
4 2
5 3
6 4
7 5
8 6
9 8
10 10
11 12
12 14
13 18
14 24
15 33
16 42
17 54
18 70
19 91
20 114
21 158
22 212
23 293
24 393
25 539
26 713
27 957
28 1301
29 1792
30 2459
31 3378
32 4615
33 6233
34 8418
35 11540
36 15867
37 21729
38 29843
39 41169
40 56534
41 77697
42 106787
43 147067
44 203025
45 280340
46 387308
47 535153
48 739671
49 1023655
50 1416635
51 1960813
52 2716922
53 3764693
54 5218926
55 7238715

List of values

[1, 1, 2, 2, 3, 4, 5, 6, 8, 10, 12, 14, 18, 24, 33, 42, 54, 70, 91, 114, 158, 212, 293, 393, 539, 713, 957, 1301, 1792, 2459, 3378, 4615, 6233, 8418, 11540, 15867, 21729, 29843, 41169, 56534, 77697, 106787, 147067, 203025, 280340, 387308, 535153, 739671, 1023655, 1416635, 1960813, 2716922, 3764693, 5218926, 7238715]

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

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