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.

A236839 Numbers that occur as results of downward remultiplication (N -> GF(2)[X]) of some number and have at least one irreducible polynomial factor encoded by a composite number.

Table of values

n a(n)
1 43
2 79
3 86
4 89
5 125
6 135
7 149
8 158
9 172
10 178
11 181
12 209
13 227
14 235
15 250
16 263
17 270
18 281
19 293
20 298
21 311
22 316
23 317
24 331
25 344
26 349
27 356
28 362
29 371
30 383
31 393
32 399
33 401
34 418
35 421
36 443
37 447
38 454
39 470
40 479
41 493
42 500
43 509
44 519
45 521
46 523
47 526
48 540
49 547
50 562
51 567
52 577
53 586
54 596
55 609

List of values

[43, 79, 86, 89, 125, 135, 149, 158, 172, 178, 181, 209, 227, 235, 250, 263, 270, 281, 293, 298, 311, 316, 317, 331, 344, 349, 356, 362, 371, 383, 393, 399, 401, 418, 421, 443, 447, 454, 470, 479, 493, 500, 509, 519, 521, 523, 526, 540, 547, 562, 567, 577, 586, 596, 609]

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

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