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.

A237989 Numbers m such that the numbers of primes, even positive integers and odd positive integers less than or equal to m are all odd.

Table of values

n a(n)
1 2
2 6
3 18
4 26
5 34
6 42
7 50
8 70
9 74
10 78
11 86
12 98
13 106
14 110
15 130
16 138
17 150
18 158
19 162
20 170
21 198
22 214
23 218
24 222
25 234
26 238
27 242
28 246
29 250
30 258
31 262
32 270
33 278
34 286
35 290
36 310
37 314
38 334
39 354
40 358
41 370
42 382
43 390
44 394
45 402
46 406
47 442
48 450
49 454
50 462
51 470
52 474
53 478
54 490
55 502

List of values

[2, 6, 18, 26, 34, 42, 50, 70, 74, 78, 86, 98, 106, 110, 130, 138, 150, 158, 162, 170, 198, 214, 218, 222, 234, 238, 242, 246, 250, 258, 262, 270, 278, 286, 290, 310, 314, 334, 354, 358, 370, 382, 390, 394, 402, 406, 442, 450, 454, 462, 470, 474, 478, 490, 502]

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

Content is available under The OEIS End-User License Agreement.