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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.

A287612 Ulam numbers k such that 4*k is also an Ulam number.

Table of values

n a(n)
1 1
2 2
3 4
4 18
5 114
6 131
7 180
8 258
9 324
10 412
11 431
12 605
13 646
14 864
15 1037
16 1081
17 1101
18 1167
19 1296
20 1313
21 1404
22 1470
23 1765
24 1856
25 1858
26 1900
27 1944
28 2032
29 2117
30 2327
31 2572
32 2630
33 2635
34 2674
35 2787
36 2809
37 2814
38 2897
39 3068
40 3214
41 3219
42 3261
43 3393
44 3451
45 3591
46 3622
47 3630

List of values

[1, 2, 4, 18, 114, 131, 180, 258, 324, 412, 431, 605, 646, 864, 1037, 1081, 1101, 1167, 1296, 1313, 1404, 1470, 1765, 1856, 1858, 1900, 1944, 2032, 2117, 2327, 2572, 2630, 2635, 2674, 2787, 2809, 2814, 2897, 3068, 3214, 3219, 3261, 3393, 3451, 3591, 3622, 3630]