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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.

A381189 Ulam numbers that are squarefree semiprimes.

Table of values

n a(n)
1 6
2 26
3 38
4 57
5 62
6 69
7 77
8 82
9 87
10 106
11 145
12 155
13 177
14 206
15 209
16 219
17 221
18 253
19 309
20 319
21 339
22 341
23 358
24 382
25 451
26 485
27 497
28 502
29 566
30 685
31 695
32 734
33 781
34 849
35 866
36 893
37 905
38 949
39 1018
40 1037
41 1079
42 1081
43 1101
44 1157
45 1167
46 1169
47 1186
48 1191
49 1257
50 1313
51 1355
52 1387
53 1389

List of values

[6, 26, 38, 57, 62, 69, 77, 82, 87, 106, 145, 155, 177, 206, 209, 219, 221, 253, 309, 319, 339, 341, 358, 382, 451, 485, 497, 502, 566, 685, 695, 734, 781, 849, 866, 893, 905, 949, 1018, 1037, 1079, 1081, 1101, 1157, 1167, 1169, 1186, 1191, 1257, 1313, 1355, 1387, 1389]

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

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