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.

A236838 Numbers whose binary representation encodes a polynomial over GF(2) with the property that at least one of its irreducible factors is encoded by a composite number.

Table of values

n a(n)
1 25
2 43
3 50
4 55
5 79
6 86
7 87
8 89
9 91
10 100
11 110
12 115
13 117
14 125
15 133
16 135
17 143
18 145
19 149
20 158
21 159
22 171
23 172
24 174
25 178
26 181
27 182
28 185
29 200
30 203
31 209
32 213
33 220
34 227
35 230
36 234
37 235
38 237
39 247
40 249
41 250
42 253
43 263
44 266
45 267
46 270
47 279
48 281
49 285
50 286
51 290
52 293
53 298
54 299

List of values

[25, 43, 50, 55, 79, 86, 87, 89, 91, 100, 110, 115, 117, 125, 133, 135, 143, 145, 149, 158, 159, 171, 172, 174, 178, 181, 182, 185, 200, 203, 209, 213, 220, 227, 230, 234, 235, 237, 247, 249, 250, 253, 263, 266, 267, 270, 279, 281, 285, 286, 290, 293, 298, 299]

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

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